Place Brussels sprouts in a steamer basket over boiling water. Cover saucepan and steam 8-10 minutes or until Brussels sprouts are tender yet crisp.
Melt the butter in a deep skillet, add the onions and 3 tablespoons vinegar; cook until onions brown.
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Melt the butter in a deep skillet, add the onions and 3 tablespoons vinegar; cook until onions brown.
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