mushy peas
US /ˈmʌʃ.i ˈpiːz/
UK /ˈmʌʃ.i ˈpiːz/

1.
a traditional British side dish made from marrowfat peas that are boiled and mashed to a thick, green, mushy consistency, often served with fish and chips
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Fish and chips just aren't complete without a side of mushy peas.
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She learned how to make authentic mushy peas from a British cookbook.