lyonnaise

/ˌlaɪəˈneɪz/
adjective
  1. Cooked with onions, especially sliced or chopped onions, often in butter or oil.
    • I ordered the lyonnaise potatoes, which came with crispy golden onions.
    • The restaurant's lyonnaise green beans were a hit at the dinner party.
    • She prepared a lyonnaise salad with warm bacon dressing and sautéed onions.
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