Makes about 4 1/2 cups; 10 to 12 servings

Notes: If making up to 3 days ahead, cover airtight and chill. Reheat in a microwave-safe dish in a microwave oven at full power (100%) for about 4 minutes, stirring halfway through.

How to Make It

Step 1

In a 5- to 6-quart pan over medium-high heat, melt butter with olive oil. Add onions and stir often until they're limp and liquid has evaporated, 8 to 10 minutes.

Step 2

Add 2 cups wine and the sugar; stir occasionally until liquid has evaporated and onions are sweet to taste and very tender, about 30 minutes. Add balsamic vinegar and salt to taste; stir often until flavors are blended, about 5 minutes. Serve warm.

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