[bur blahngk; Fr. bœr blahn] 
| a reduction sauce of wine vinegar and shallots, cooked with butter and beaten until thick and foamy. |
| beurre blanc (bûr' blängk', bɶr bläɴ') n. A sauce made with butter, shallots, and vinegar, white wine, or lemon juice. [French : beurre, butter + blanc, white, not browned.] |