tartar sauce
US /ˈtɑːr.tər ˌsɑːs/
UK /ˈtɑːr.tər ˌsɑːs/
1.
a cold sauce made of mayonnaise, chopped pickles, capers, and herbs, typically served with fried fish or seafood
:
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I always order my fish and chips with a side of tartar sauce.
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The restaurant's homemade tartar sauce is a must-try.