Active Time
15 MIN
Total Time
1 HR
Yield
Serves : 8

How to Make It

Step

In a medium saucepan, melt the butter in the olive oil. Add the onions and cook over moderate heat until softened, about 7 minutes. Add the water, balsamic vinegar, sugar and rosemary and season with salt. Cover partially and simmer over low heat until tender, about 30 minutes. Uncover the onions and simmer until the juices are syrupy, about 15 minutes longer. Discard the rosemary and serve warm.

Make Ahead

The onions can be refrigerated overnight. Reheat gently.

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