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The bottle that makes stir fried greens taste like the restaurant version. Savoury, thick and nothing like as fishy as the name suggests.
What is oyster sauce?
Oyster sauce is a thick, dark brown Chinese sauce made from oyster extract, sugar and salt, thickened with cornflour. It is savoury and slightly sweet with a glossy, syrupy texture. It does not taste strongly of oysters, and it is used for depth in stir fries rather than as a seafood flavour.
The sauce was created in Guangdong in 1888 by Lee Kum Sheung, who left a pot of oyster soup on the heat too long and found the reduced result worth selling. The company he founded, Lee Kum Kee, is still the best known brand.
What does oyster sauce taste like?
Salty and savoury first, with a caramel sweetness behind it and a faint mineral note from the oyster. It is closer to a thick, sweetened soy sauce than to anything seafood flavoured. A tablespoon adds body to a sauce that soy alone would leave thin.
What to use oyster sauce for
- Stir fried greens. Pak choi or broccoli, blanched then tossed with garlic and a spoon of oyster sauce.
- Beef and vegetable stir fries, mixed with soy sauce and a little sugar.
- Marinades for chicken or pork, where it helps the meat brown.
- Fried rice and noodles, a teaspoon at a time for depth.
- A base for a dipping sauce, loosened with water and rice vinegar.
Add it near the end of cooking. Long boiling dulls the flavour and can make it taste flat.
Oyster sauce, soy sauce or hoisin?
All three are dark and savoury, and none of them swaps cleanly for another. Soy is thin and salty, oyster sauce is thick and rounded, hoisin is sweet and spiced.
| Oyster sauce | Soy sauce | Hoisin | |
|---|---|---|---|
| Texture | Thick, syrupy | Thin, watery | Thick, like ketchup |
| Main taste | Savoury, mildly sweet | Salty | Sweet, garlicky |
| Made from | Oyster extract, sugar, salt | Fermented soybeans and wheat | Fermented soybean paste, sugar, spices |
| Best for | Greens, stir fry sauces | Seasoning anything | Glazes, duck pancakes |
Is oyster sauce vegetarian?
No. Standard oyster sauce contains real oyster extract. Vegetarian oyster sauce exists and is made with shiitake or straw mushrooms instead, sold as mushroom stir fry sauce or vegetarian oyster sauce. It behaves the same way in cooking and tastes close enough that most people will not spot the swap.
Which one to buy
Read the ingredients. Better bottles list oyster extract high up. Cheaper ones lead with water, sugar and caramel colour, with the oyster somewhere near the end, and they taste correspondingly flat.
- Look for oyster extract in the first three ingredients.
- Avoid anything where caramel colour sits above the oyster.
- Chinese supermarkets carry a wider range and larger bottles.
- Buy the smaller bottle unless you cook Chinese food weekly.
Where to buy it and how to store it
Every major UK supermarket stocks it in the world food aisle, and Chinese grocers carry more brands at better prices. Once opened, keep the bottle in the fridge. It lasts several months, though the flavour dulls over time, and it thickens when cold.
Frequently asked questions
Does oyster sauce taste fishy?
Not really. The oyster is reduced and sweetened until what is left is a savoury depth rather than a seafood flavour. People who dislike shellfish usually eat it happily without knowing what it is.
Is oyster sauce gluten free?
Usually not. Most brands contain wheat, either directly or through added soy sauce. Gluten free versions exist and say so clearly on the label, so check rather than assume.
Can I use soy sauce instead of oyster sauce?
Only at a push. Soy sauce brings the salt but none of the sweetness or body, so add half a teaspoon of sugar and a pinch of cornflour per tablespoon to get closer.
Does oyster sauce need refrigerating?
Yes, once the bottle is open. It keeps for months in the fridge. Left in a warm cupboard it darkens and loses flavour much faster.
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- Oyster sauce. A dark, salty sauce used in most Cantonese stir fries.
