Cover image via Hot Thai Kitchen
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Oyster sauce is one of those kitchen staples that instantly makes everything taste better, from simple vegetable stir-fries to your go-to fried noodles
But have you ever wondered if there are actually oysters in oyster sauce?
Short answer: yes, but not always in the way you think.
Traditional oyster sauce is made from real oysters
The original method involves simmering oysters in water until their juices reduce into a thick, dark, flavour-packed sauce.
That rich umami depth comes directly from the concentrated oyster juices.
But most modern store-bought versions are made differently
Instead of whole oysters, many brands now use oyster extract.
According to Hot Thai Kitchen, this extract is a concentrated liquid made by cooking and processing oysters into a flavourful broth.
It is then blended with ingredients like sugar, salt, water, soy sauce, and cornstarch, which gives the sauce its thick consistency.
Most mainstream brands use oyster extract in varying amounts, depending on the product.
Premium versions tend to list it as a key ingredient, while budget options may use smaller amounts combined with flavouring and seasonings.
For example, Lee Kum Kee's Premium Oyster Sauce uses oyster extract alongside water, sugar, and cornstarch to build its flavour and texture.
So while oysters are still part of the process, you're not getting anything close to whole seafood in the bottle.
Oyster sauce doesn't taste like fresh oysters because the cooking process transforms it into something else entirely
Instead of a seafood-forward flavour, it develops a deep savoury sweetness known as umami, which is why it works more like a seasoning that enhances dishes rather than tasting fishy or briny.
According to Lee Kum Kee, one of the most well-known oyster sauce producers, the condiment was accidentally invented in Guangdong, China by its founder Lee Kum Sheung.
The story goes that he overcooked a pot of oyster soup, which led to the creation of the thick, flavourful sauce. In 1888, he founded Lee Kum Kee to sell it, and the brand remains one of the most recognised names in oyster sauce today.
There's also vegetarian 'oyster' sauce
And yes, that means it contains zero oysters.
These versions are usually made with mushrooms, especially shiitake, to recreate that same deep umami flavour without any shellfish.
It's a popular alternative for vegetarians, vegans, and anyone with seafood allergies. Just be sure to check the label.
The bottom line is that all regular oyster sauces contain some form of oyster-derived ingredient, but the amount can vary widely depending on the brand
Some are rich in oyster extract, while others use only small amounts combined with flavouring and seasonings.
