Introduction

Gyeoja (겨자) is Korean hot mustard. Unlike the mild yellow mustard on hot dogs, it is a sharp, nose-tingling condiment closer in feel to wasabi or English hot mustard. Koreans add a small squeeze of it to cold noodles, whisk it into tangy salad dressings and mix it into dipping sauces for dumplings, fish cakes and boiled pork. You will usually find it as mustard powder or ready-made paste in a tube at Korean grocery stores.

Gyeoja at a Glance

Quick facts

• What it is: Korean hot mustard (powder or paste)
• Main ingredients: ground mustard seed, water; pastes may add vinegar, salt and oil
• Taste: sharp, pungent heat that rises into the nose and fades quickly
• Main uses: naengmyeon, gyeojachae salad, dipping sauces, jellyfish salad, cold dishes

What is Gyeoja Made Of?

Gyeoja is made from ground mustard seeds. When the powder is mixed with warm water and left to rest for several minutes, enzymes in the seed release the sharp, volatile compounds that give it heat. Tube pastes are pre-mixed and often include vinegar, salt, oil and starch for a smooth texture.

Types of gyeoja

• Gyeoja powder (gyeoja-garu): the most pungent; mix with water as needed.
• Tube paste (yeon-gyeoja): ready to use, convenient for noodles and dips.
• Gyeoja sauce: mustard mixed with vinegar, sugar and salt as a dressing.
• Restaurant squeeze bottles: diluted mustard served at naengmyeon shops.

What Does Gyeoja Taste Like?

Gyeoja hits fast with a clean, sinus-clearing heat rather than a lingering chili burn. It is slightly bitter on its own, but mixed with vinegar and sugar it becomes bright and refreshing, which is why it pairs so well with icy noodles and chilled salads.

Popular Korean Dishes That Use Gyeoja

Naengmyeon

Cold buckwheat noodles are traditionally seasoned at the table with mustard and vinegar.

Gyeojachae

A cold mixed salad of vegetables, fruit and meat or seafood in mustard dressing. Recipe below.

Haepari naengchae

Chilled jellyfish salad with cucumber and a sharp mustard sauce, a classic party dish.

Dipping sauces

A dab of mustard mixed into soy sauce is popular with fish cakes, mandu and boiled pork.

Easy Gyeojachae Recipe (Serves 3–4)

Ingredients

• 1 cucumber, cut into thin matchsticks
• 1/2 carrot, cut into thin matchsticks
• 1/2 Asian pear (or crisp apple), cut into matchsticks
• 8 cooked shrimp, halved, or 4 oz thinly sliced cooked beef or ham
• 4 imitation crab sticks, shredded
• 1 egg, made into a thin omelet and sliced into strips
• A handful of pine nuts (optional)

Mustard dressing

• 1–1 1/2 tbsp prepared Korean mustard (or 1 tbsp powder mixed with 1 tbsp warm water and rested 10 minutes)
• 3 tbsp vinegar
• 2 tbsp sugar
• 1 tsp soy sauce
• 1/2 tsp salt
• 1 clove garlic, finely grated
• 1 tbsp water or pear juice

Instructions

1. If using mustard powder, mix it with warm water into a paste, cover and let it sit for about 10 minutes to develop its heat.
2. Whisk the mustard with vinegar, sugar, soy sauce, salt, garlic and water until the sugar dissolves. Taste and add more mustard for extra kick.
3. Soak the cut cucumber, carrot and pear in ice water for 5 minutes to crisp them, then drain very well.
4. Arrange the vegetables, pear, shrimp or meat, crab sticks and egg strips in a large bowl.
5. Pour over the dressing just before serving, toss gently and top with pine nuts.

Tip: Keep everything well chilled. Gyeojachae is best served cold, and the dressing tastes sharper and fresher on crisp, icy vegetables.

Where to Buy Gyeoja

United States

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Amazon
Search Korean mustard (gyeoja) on Amazon

H-Mart
Search mustard on H-Mart

Canada

Search Korean mustard on Amazon.ca

Europe

Search Korean mustard on Amazon.co.uk

How to Store Gyeoja

Keep mustard powder in an airtight container in a cool, dry place away from light; it keeps its punch for many months. Tube paste should be capped tightly and refrigerated after opening, as heat and air dull its sharpness. Mix only as much powder as you need, because freshly prepared mustard loses its heat within a day.

Gyeoja FAQ

Is Korean mustard the same as wasabi?

No. Gyeoja is made from mustard seeds, while wasabi comes from a different plant. Both have a similar sharp, nose-tingling heat, which is why they are often compared.

What can I use instead of Korean mustard?

English hot mustard powder or Chinese hot mustard is the closest substitute. Dijon works in a pinch but is milder and tangier.

Why is my mustard not spicy?

Mustard powder needs time to react with water. Mix it with lukewarm (not boiling) water and wait about 10 minutes before using.

Conclusion

Gyeoja is a small condiment with a big job: it wakes up cold noodles, sharpens salads and gives dipping sauces a clean kick. Keep a tube or a tin of powder in your kitchen and try it in a chilled gyeojachae salad. Then try it the classic way with a bowl of naengmyeon.