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beurre blanc

[bur blahngk; French bœr blahn]
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noun French Cookery.
  1. a reduction sauce of wine vinegar and shallots, cooked with butter and beaten until thick and foamy.

Origin of beurre blanc

1930–35; < French: literally, white butter
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018