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Hoisin sauce, if you have it, loosened with a bit of water. Depending on the recipe, maybe even BBQ sauce or ketchup with a dash of worcestershire in it!
What are you making and what is the list of ingredients in the dish/sauce? Oyster sauce is a pretty dominant flavor and I don't really see any real substitute, so in this case you may be better off moving along to another dish. If shellfish allergy is the issue, there is a commercial product made of mushrooms that is called vegetarian oyster sauce that will fit the flavor and consistency profile better than, say, a dash of Worcestershire sauce with a little sugar for sweetness.
Spicy basil chicken- no shellfish allergy ?2 tablespoons chili oil2 cloves garlic3 hot chile peppers1 pound skinless, boneless chicken breast halves - cut into bite-size pieces1 1/2 teaspoons white sugar1 teaspoon garlic salt1 teaspoon black pepper5 tablespoons oyster sauce1 cup fresh mushrooms1 cup chopped onions1 bunch fresh basil leaves
Me, I'd wait till I had a chance to get some oyster sauce. That's quite a large amount in this recipe, and it is the only liquid ingredient. Eating pure oyster sauce doesn't sound very appealing, honestly. I've used it mostly when there are other ingredients (like chicken stock and soy sauce) to loosen and temper it. I'd be more tempted to go for a recipe like this:
Fish sauce is a good sub
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