Vegan substitute for Fish sauce
Key facts
- Replaces
- Fish sauce
- Category
- Condiments
- Options here
- 4 tested swaps
- Easiest swap
- Kombu soy sauce — 1:1
Why the swap works
Fish sauce is fermented anchovy liquid, and its flavour includes glutamate-driven umami, salt and fermentation aromas. Fermentation does the same thing to soybeans, which is why soy sauce, tamari and miso carry the same savoury depth. Seaweed (kombu) adds its own glutamates and a marine note, and dried shiitake mushrooms contribute guanylate, which multiplies umami perception. Commercial vegan fish sauces combine these — soy, seaweed, mushroom, sometimes pineapple fermentation — to land very close to the original. In recipes, the swap is one-to-one by volume, adjusting salt since some substitutes are saltier. The one thing to mimic consciously is fish sauce's funky fermented edge, which a little extra fermentation (miso) or a drop of rice vinegar supplies.
Options, ratios and best uses
Kombu soy sauce
1:1Simmer kombu in soy with sugar, cool and strain.
Best for: curries, dressings, dips
Vegan fish sauce
1:1Pineapple or seaweed based; widely available now.
Best for: anything
Miso + lime
1 tsp miso + 1 tsp lime per tbspWhisk into liquid before adding.
Best for: dressings
Mushroom seasoning
1 tsp per tbspVery salty — adjust other salt down.
Best for: stir-fries, broths
Compare the options at a glance
| Option | Taste | Texture | Cost | Where to buy |
|---|---|---|---|---|
| Vegan fish sauce (bottled) | Salty, funky, close to original | Thin liquid | Moderate | Asian grocers, online |
| Soy sauce + kombu | Salty, marine edge | Thin liquid | Low | Any supermarket |
| Miso + water | Deep, fermented | Slightly cloudy | Low | Supermarkets, Asian grocers |
| Coconut aminos | Sweeter, less salty | Thin liquid | Moderate | Health shops |
Tips
- Add a pinch of sugar to mimic the sweetness
- Dried shiitake stock deepens the umami
- Season at the end so salt doesn't concentrate
Avoid
- Using dark soy sauce alone — too bitter
- Forgetting curry pastes may already contain shrimp
Three dishes with the swap applied
Vegan pad thai sauce
Mix 3 tbsp vegan fish sauce (or soy sauce + a strip of kombu soaked in it), tamarind paste, palm sugar and lime; taste for the salty-sour-sweet balance.
Quick 'fish' sauce
Simmer 250 ml water with a 10 cm kombu square and 4 dried shiitake for 15 minutes; add 3 tbsp soy sauce and 1 tsp salt.
Green papaya salad
Dress shredded papaya with lime, sugar, chilli and vegan fish sauce; pound in a pestle for the classic texture.
Questions people ask
Does vegan fish sauce taste the same?
Very close in cooked dishes; side by side raw, it is slightly less pungent.
What about oyster sauce?
Mushroom "oyster" sauce is a direct 1:1 substitute.
Is vegan fish sauce as good?
The best brands are very close in cooked dishes where fish sauce is a background note; in dipping sauces where it stars, expect a slightly different but still savoury result.
Can I just use soy sauce?
Yes in most cooked dishes, one-to-one. Add a little seaweed or mushroom if the recipe leans on the marine flavour.
Is fish sauce in all Thai food?
Nearly — it is the default seasoning. Ask for 'jae' (vegan Buddhist) preparation, which excludes it.
Related swaps
Free to reuse under CC BY 4.0 with a link back.
A substitution is not a nutrition guarantee
Choose a replacement for the job the original ingredient performs: binding, aeration, thickening, fat or flavour. A mushroom can imitate a patty's shape while providing much less protein; a nut cream can mimic dairy texture without its calcium or B12 fortification. Check the actual product and the rest of the meal.
Ratios are starting points unless a complete recipe has been tested with that exact replacement. Brand formulation, water content and cooking method change the result. Try a small batch for important bakes, and check soy, nuts, sesame and wheat allergens even when a product is labelled vegan.
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