Korean Seaweed Cucumber Cold Soup | Miyeok Oi Naengguk with Wild PNW Seaweed
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| A cold, tangy bowl of miyeok oi naengguk made from wild seaweed I harvested in Washington State. |
Some foods stay in our memory for decades.
They do not have to be expensive or complicated.
Sometimes they are simply the foods our mothers made when we were children—the dishes that appeared every summer, every winter, or every special season until their flavor became part of our memories.
For me, one of those foods is Korean seaweed and cucumber cold soup.
My mother once told me that when she was pregnant with me, she constantly craved sour foods.
She wanted foods made with vinegar, sour fruit, and even well-fermented sour kimchi.
Apparently, that taste never left me.
Even now, as I am getting close to fifty, I still absolutely love sour food.
Give me something cold, tangy, vinegary, and refreshing on a hot summer day, and I am happy.
That may be why I have never forgotten the bowls of cold seaweed and cucumber soup my mother made for us every summer when I was young.
Cool.
Tangy.
Crunchy.
Light.
And wonderfully refreshing.
Today, I am making that childhood summer food again.
But this time, the seaweed came from somewhere very special.
I harvested it myself from the coastal waters of Washington State in May 2026.
From the Pacific Northwest coast to my Korean table, this bowl brings two parts of my life together.
What Does Miyeok Oi Naengguk Mean?
The Korean name can look a little complicated if you have never seen it before, but it is actually very simple.
Miyeok (미역) means seaweed.
Oi (오이) means cucumber.
Naengguk (냉국) refers to a cold soup or chilled broth, often served very cold and sometimes with ice.
So Miyeok Oi Naengguk is essentially a cold Korean seaweed and cucumber soup.
After this explanation, I am going to use a simpler English description throughout most of this post:
Seaweed Cucumber Salad (Cold Soup Style).
That may not be the literal Korean name, but it gives English-speaking readers a good idea of what the dish feels like—part crisp seaweed-cucumber salad, part refreshing cold broth.
A Korean Summer Food I Never Forgot
Cold soups are very familiar in Korean summer cooking.
When the weather is hot and a heavy meal does not sound appealing, chilled dishes become especially comforting.
Seaweed Cucumber Salad (Cold Soup Style) is one of those foods.
The soft seaweed, crisp cucumber, thin onion, tangy broth, sesame, and ice make it cooling without feeling plain.
Every Korean household may prepare it a little differently.
Some people make the broth sweeter.
Some make it more sour.
Some add green onion.
Some add peppers.
Some keep the seasoning very mild.
And people like me, who truly love sour food, may naturally reach for a little extra vinegar.
That flexibility is part of what makes home cooking so special.
There is not always one single correct bowl.
There is the bowl your family likes.
And for me, this particular flavor will always remind me of my mother.
From Wild Washington Seaweed to My Kitchen
The seaweed I used today did not come from a grocery-store package.
I harvested it during the spring seaweed season in Washington State in May 2026.
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| From the cold coastal water of the Pacific Northwest to a Korean summer table— this seaweed was harvested in May 2026 and preserved for later use. |
Bringing wild seaweed home is only the beginning.
After harvesting it, I carefully rinsed it, blanched it, cooled it, and prepared it for storage.
Some seaweed can be dried.
Some can be frozen.
Then later, when the season has passed, I can take it out again and use it in warm soup, cold soup, seasoned dishes, or other Korean-style meals.
That process is one of the things I enjoy most about wild food.
The meal does not begin when I turn on the stove.
It begins much earlier—when I learn the regulations, choose a clean harvesting location, identify the seaweed, harvest only what I need, clean it, preserve it, and save it for another season.
Then months later, I can open the pantry or freezer and suddenly bring the coast back into my kitchen.
That feels very special to me.
Why Seaweed Has Such a Special Place in Korean Food
Seaweed is deeply familiar in Korean food culture.
We eat it in warm soups, cold soups, seasoned side dishes, salads, and many other preparations.
Perhaps the best-known Korean seaweed dish is miyeok-guk, or seaweed soup.
In Korea, seaweed soup is traditionally associated with mothers after childbirth, and it is also commonly eaten on birthdays.
But seaweed is not only special-occasion food.
It is ordinary home food too.
That is how I remember it.
Warm seaweed soup in cooler weather.
Seasoned seaweed dishes with meals.
And when summer became hot, cold seaweed and cucumber soup.
Seaweed also contains iodine, minerals, and dietary fiber.
I especially appreciate sea vegetables because they fit naturally into meals and add both texture and flavor.
However, seaweed can be very high in iodine depending on the species and preparation.
That means more is not always better.
People with thyroid disease or those who take thyroid medication should not assume that eating large amounts of seaweed will automatically help their condition.
If you have thyroid disease, kidney disease, need to monitor sodium or potassium, are pregnant, or have another medical concern, it is best to discuss regular seaweed intake with your healthcare provider.
I enjoy seaweed as food.
Not as medicine.
And I think that is an important distinction.
Seaweed Cucumber Salad (Cold Soup Style) Recipe
This is the version I made today using my preserved wild Washington seaweed.
Ingredients
Main Ingredients
Prepared dried seaweed
1 cucumber, julienned
Thinly sliced onion
1 jalapeño, thinly sliced
Plenty of ice
Seasoning
3 tablespoons vinegar
1 tablespoon Korean tuna sauce, or chamchi-aek
Roasted sesame seeds
1 tablespoon soy sauce
1/2 tablespoon sesame oil
1 tablespoon allulose or sugar
2 cups cold water
A small amount of cayenne pepper
Step 1 — Soak the Seaweed
If you are using dried seaweed, soak it in water for about 30 minutes.
For this recipe, I am using seaweed that I personally harvested here in Washington State last May, then prepared and dried for later use.
If you do not have your own dried seaweed, that is completely fine. You can find dried miyeok at many Asian grocery stores, and it is also available online, including through Amazon.
If you are not sure what kind of dried seaweed Koreans usually buy for dishes like this, leave me a comment. I would be happy to share the types and products that are commonly used in Korean cooking.
Dried seaweed expands considerably once rehydrated, so you usually need less than you think.
When it has softened, drain it well and gently squeeze out the excess water.
If the pieces are too large, cut them into comfortable bite-size pieces.
I always find this part interesting.
Something that looked dry and small suddenly becomes soft, glossy, and full again.
Step 2 — Add Cucumber, Onion, and Jalapeño
Place the prepared seaweed in a large bowl.
Add the julienned cucumber.
Then add thinly sliced onion and jalapeño. (The jalapeño is completely optional.)
The cucumber is especially important in this dish.
The seaweed is soft and tender.
The cucumber is cool and crisp.
Together, those two textures make the whole bowl much more refreshing.
The onion adds a little sharpness, while the jalapeño gives it a fresh green heat.
Step 3 — Add the Seasoning
Now add:
3 tablespoons vinegar
1 tablespoon Korean tuna sauce
Roasted sesame seeds
1 tablespoon soy sauce
1/2 tablespoon sesame oil
and
1 tablespoon allulose or sugar
Mix everything together.
At this point, the cucumber and seaweed are already coated in that sweet, sour, savory seasoning.
The smell of vinegar, sesame, and seaweed together immediately reminds me of Korean summer food.
Step 4 — Add Cold Water
Pour in 2 cups of cold water.
Mix everything well.
Then taste the broth.
This is where home cooking becomes personal.
If you want it more sour, add a little more vinegar.
If you want it slightly sweeter, add a little more sweetener.
If you want a little more savory depth, adjust the soy sauce carefully.
For me, the sourness is very important.
But I know not everyone loves vinegar as much as I do.
Step 5 — Finish with Cayenne Pepper and Ice
Add a small amount of cayenne pepper. (This is completely optional.)
I do not use much.
Just enough to add another little layer of warmth behind all that cold, tangy flavor.
Then add plenty of ice.
I like this dish very cold.
The ice changes the entire feeling of the bowl.
It becomes something you truly want on a hot summer afternoon.
Mix everything once more.
And that is it.
Your Seaweed Cucumber Salad (Cold Soup Style) is ready.
Mmm… So Good
The first thing I notice is the vinegar.
Bright.
Tangy.
Refreshing.
Then comes the cucumber.
The soft seaweed.
The sesame.
The little bit of heat from the jalapeño and cayenne.
And the ice keeps everything cold right to the end.
Mmm...
So good.
This is one of those foods I could eat again and again during the summer.
And every time I taste it, a small part of me remembers my mother's kitchen.
You Can Add Noodles or Rice
You do not have to eat this only as a side dish.
It can easily become a complete summer meal.
Cook almost any noodles you enjoy.
Thin wheat noodles work very well.
Somen noodles are wonderful.
Udon also works.
After cooking the noodles, rinse them thoroughly under cold water.
Drain them well.
Then add them directly to the cold seaweed broth.
Now you have a refreshing cold noodle meal.
You can also add rice.
Or simply eat the cold soup exactly as it is.
That is one of the things I like most about this dish.
It can be simple, or it can become a full meal.
A Bowl That Connects Two Homes
When I was young, I never thought very much about where my mother's seaweed came from.
I simply ate the food she made.
I certainly never imagined that many years later I would be living across the Pacific Ocean, standing in cold Washington water, harvesting seaweed myself.
Life sometimes connects things in unexpected ways.
The child who grew up eating her mother's summer seaweed soup in Korea eventually came to the Pacific Northwest.
And now I can harvest seaweed here, preserve it, and make that same familiar Korean summer food.
This bowl feels Korean to me.
But the seaweed came from Washington.
And somehow the two belong together beautifully.
That is probably one of the reasons I love wild food so much.
It connects place, memory, culture, and season all at once.
Watch My Seaweed Cucumber Salad Videos
If you would like to see this recipe rather than only read about it, I filmed both a full video and a Short.
Long Video:
Wild PNW Seaweed to Korean Seaweed Cucumber Cold Soup
In the full video, I show the process more slowly and include the exact seasoning measurements.
Short Video:
I Harvested This Seaweed… Then Made a Korean Summer Favorite!
The Short shows the quick journey from preserved wild seaweed to the finished cold summer bowl.
Join Wild Harvest Life PNW on YouTube
If you enjoy wild edible plants, mushrooms, berries, seaweed, shellfish, fishing, and Korean-style cooking, you can also join me on YouTube.
I share what I find in the forests, mountains, rivers, and coastal waters of the Pacific Northwest—and sometimes those wild foods eventually make their way into my kitchen.
Wild Harvest Life PNW on YouTube
Stay tuned for more Wild Harvest Life PNW adventures. 🌿
Related Article
Seaweed in Washington State
If you would like to see the bigger story behind the seaweed used in this recipe, read:
Seaweed in Washington State – The Korean Seaweed Soup My Husband Keeps Asking For
That article goes deeper into harvesting seaweed in Washington, preparing it after harvest, Korean seaweed traditions, and how I use it in our kitchen.
Next Read
A Wild Green Called “Miyeokchwi”
If you enjoyed this seaweed story, here is something a little unexpected for your next read.
Canada goldenrod (Solidago canadensis) is also known among some Korean foragers as seoyang-miyeokchwi (서양미역취) or yang-miyeokchwi (양미역취).
It is not seaweed at all—it is a wild land plant.
But when the young leaves are blanched, they can develop a slightly slippery texture and a soft bite that may remind you a little of sea vegetables. That connection makes the Korean name miyeokchwi especially interesting to me.
I harvested the young leaves in Washington State and prepared them Korean-style as namul.
If you are curious about this unusual wild green and the Korean food memories it brought back for me, read the story next:
Canada Goldenrod: A Wild Green That Brought Back My Korean Chwinamul Memories
Washington Seaweed Harvesting Safety & Rules
If you plan to harvest seaweed in Washington State, always check the current official regulations before you go.
For recreational seaweed harvesting, Washington requires a valid Shellfish/Seaweed license or a Combination fishing license. The general recreational daily limit is 10 pounds of seaweed per person in wet weight, although additional local restrictions and closures can apply.
Most Washington State Park beaches are closed to seaweed harvesting.
The current State Parks rule allows seaweed harvesting only at:
Fort Flagler State Park
Fort Ebey State Park
Fort Worden State Park
and only from April 16 through May 15 each year, during posted park hours.
Special harvesting methods also apply in State Parks.
Bull kelp must be cut at least 24 inches above the bulb.
Short-stemmed kelps must be cut at least 12 inches above the anchor point.
The holdfast or anchor point should remain attached.
Seaweed must be cut with a knife or similar tool rather than torn from the substrate, and rakes or similar tined tools are prohibited.
Seaweed may not be harvested if herring eggs are attached.
Water quality also matters.
Washington Department of Fish & Wildlife recommends checking the Washington Department of Health shellfish safety map on the day you plan to harvest because pollution and biotoxin advisories can change quickly.
Before harvesting, check:
Washington State Parks – Fishing, Shellfishing & Seaweed Harvesting
Washington State Parks seaweed harvesting information
Washington Department of Fish & Wildlife – Kelp and Seaweed Harvesting
WDFW kelp and seaweed information
Washington Department of Fish & Wildlife – Fishing License Types
WDFW Shellfish/Seaweed license information
Regulations can change, so always rely on the current official rules rather than an older blog post or video.
Harvest gently.
Take only what you will actually use.
Choose clean water.
Watch the tide and weather.
And leave the habitat in good condition for the next season.
Thank you for visiting Wild Harvest Life PNW.
This may look like a simple bowl of seaweed, cucumber, vinegar, water, and ice.
But for me, it carries much more than that.
It carries memories of my mother.
It carries summers in Korea.
It carries the cold coastal water of Washington State.
And it carries the strange and beautiful way that food from childhood can follow us across an ocean and become part of a completely different life.
From the Pacific Northwest coast to my Korean table, this wild seaweed truly feels like one of nature's gifts.
Stay tuned for more Wild Harvest Life PNW adventures! 🌿
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