Som tam — the beloved Thai salad made with pounded green papaya, chili, lime, and fish sauce — is one of those dishes that brings every flavor together at once: sour, sweet, salty, and spicy.
This Japanese-style bitter melon salad takes the spirit of som tam and reimagines it with summer vegetables from the Japanese kitchen.
Instead of fish sauce, the dressing is built on ume vinegar — the tangy, floral brine left behind after making umeboshi (Japanese pickled plums). It gives the salad a gentle acidity with a hint of salt, without the need for fish sauce.
The result is a crisp, refreshing side dish that’s naturally vegan and comes together in minutes — no cooking, no mortar required.
Bitter melon and cucumber take the place of green papaya, while cherry tomatoes add bursts of sweetness that balance the bitterness. One of my favorite simple vegan summer salads.
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🧺 Why you'll love this recipe
- Naturally vegan — ume vinegar replaces fish sauce
- No cooking required — just slice, mix, and serve
- Crisp & refreshing texture — bitter melon and cucumber
- Balanced in every bite — sour, sweet, salty, and a touch of bitterness
- Extra protein — Add freeze-dried tofu (koya tofu / 高野豆腐) for a heartier salad
🌿 What is bitter melon?
Bitter melon (also called bitter gourd) is a bumpy, bright green vegetable widely used across East and Southeast Asian cooking — from Okinawan champuru to Indian karela dishes. Despite its name, it's not just about bitterness: when balanced with the right flavors, it becomes one of the most refreshing vegetables of summer.
The bitterness comes from compounds called momordicin, and while some find it an acquired taste, it pairs beautifully with acidic dressings like this one. The key is in how you prepare it.
🔪 How to prepare bitter melon
Slice it in half lengthwise and scoop out the seeds and white pith with a spoon — this is where most of the bitterness lives. Then slice thinly.
If the bitterness is still too strong for your taste, a light salt rub followed by a quick rinse in cold water will mellow it out, though the texture will soften slightly.
The bitterness tends to mellow once the vegetables are tossed with the dressing — so taste as you go and decide what works for you the best.
🥒 Ingredients
Vegetables
- Cucumber
- Bitter melon
- Cherry tomatoes
- Freeze-dried tofu (koya tofu / 高野豆腐) — optional
About koya tofu
Koya tofu is Japanese freeze-dried tofu — firm, spongy, and excellent at soaking up flavors.
It's traditionally made by freezing tofu overnight in the cold mountain air, then drying it.
Before using, rehydrate it in water and slice it.
It adds a satisfying chew and a quiet protein boost to the salad. Any excess liquid from the vegetables gets absorbed right into it — nothing goes to waste.
Dressing
- Ume vinegar (white plum vinegar) — homemade or store-bought
- Sugar
- Ground sesame seeds
🫙 Why ume vinegar?
Ume vinegar — known in Japanese as umezu (梅酢) — is the tangy, salty brine that forms naturally when making umeboshi (Japanese pickled plums). It's not a vinegar in the traditional sense, but it acts like one: bright, floral, and gently salty all at once.
In this salad, it does the work that fish sauce and lime juice do in a classic som tam — bringing acidity and depth to the dressing without any animal products. The result is lighter and more delicate, but no less satisfying.
You can make your own if you have umeboshi at home, or find it at Japanese grocery stores and online. Homemade white ume vinegar →
🌿 No ume vinegar? Mix a splash of rice vinegar with a little finely minced umeboshi — it won't be identical, but it gets you close.
🥣 Instructions
- Prep the vegetables
- Slice the bitter melon thinly.
- Cut the cucumber into thin matchsticks.
- Roughly chop the cherry tomatoes.
- If using koya tofu, rehydrate it in water and slice to your preferred size.
🌿 If the bitterness feels too strong, lightly salt the bitter melon slices, let sit for a few minutes, then rinse in cold water. The texture will soften slightly.
- Make the dressing
- Add the chopped cherry tomatoes and seasonings to a bowl.
- Using a pestle or the back of a spoon, crush the tomatoes while mixing until the sugar dissolves.
🌿 Crushing the tomatoes draws out their sweetness and acidity — this forms the base of the dressing.
- Toss
- Add the sliced vegetables to the bowl and toss well with the dressing.
- Let them sit for a few minutes, or longer if you have time, to allow the flavors to come together.
🌿 Chill in the fridge if you prefer it cold.
- Finish
- Top with ground sesame seeds and koya tofu, if using.
- Serve alongside rice or your favorite summer dish.
☀️ Storage
Keeps in the fridge for up to 2 days. The flavors deepen over time, though the vegetables will lose some of their crunch.
If any liquid collects at the bottom, let koya tofu absorb it — it soaks up the dressing and adds volume to the salad.
📘 Variations
- More tomatoes — for a sweeter, tangier dressing
- Peanuts or mixed nuts — for extra crunch
- Fresh mint or shiso leaves — for a more aromatic, summery finish
📚 FAQ
Yes, completely. Ume vinegar replaces fish sauce, making this naturally vegan and vegetarian-friendly.
It has a distinctive bitterness, but here it’s balanced by the sweetness of cherry tomatoes and sugar in the dressing. The bitterness also mellows as it marinates.
Green papaya is the closest substitute and the most traditional choice for som tam. Zucchini or cucumber alone also work.
Yes — koya tofu (freeze-dried tofu) is the easiest addition. Edamame also work well.
Yes. It keeps in the fridge for up to 2 days and the flavors deepen over time.
🌻 More Bitter Melon Recipes
🍙 Recipes with Ume Vinegar
🥗 More Vegan Salads
✏️ Recipe Card
Bitter Melon Salad (Vegan Som Tam with Ume Vinegar Dressing)
Ingredients
Vegetables
- ½ cucumber (70–90g, cut into thin matchsticks)
- ½ bitter melon (100g, thinly sliced)
- 5 cherry tomatoes (100g, roughly chopped)
- ½ piece koya tofu (freeze-dried tofu, rehydrated and sliced — optional)
Dressing
- 1 tablespoon ume vinegar (white plum vinegar)
- 2 teaspoon sugar
- ground sesame seeds (to taste)
Instructions
- Prep the vegetables — slice the bitter melon, cut the cucumber into matchsticks, and roughly chop the cherry tomatoes. If using koya tofu, rehydrate in water and slice.½ cucumber½ bitter melon5 cherry tomatoes½ piece koya tofu
- Make the dressing — add cherry tomatoes and seasonings to a bowl. Crush the tomatoes with a pestle or spoon while mixing, until the sugar dissolves.1 tablespoon ume vinegar2 teaspoon sugar
- Toss — add vegetables to the bowl and toss well. Let sit for a few minutes, or longer if time allows.
- Finish — top with ground sesame seeds and koya tofu if using. Serve alongside rice or your favourite summer dish.ground sesame seeds
Notes
- If the bitterness feels too strong, lightly salt the bitter melon slices, let sit for a few minutes, then rinse in cold water. The texture will soften slightly. The bitterness also mellows as it marinates with the dressing.
- No ume vinegar? Mix a splash of rice vinegar with a small amount of finely minced umeboshi.
💐 Closing
Ume vinegar is one of those quiet kitchen treasures that goes far beyond salad dressings.
Try it in homemade pickled ginger or red shiso furikake, or make your own with this homemade ume vinegar recipe.
The bright color and gentle saltiness offer a kind of relief on humid summer days — something that feels light, yet quietly restorative.
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