Step by step

Method

5 steps

1. 1

   Combine 2 Tbsp olive oil and garlic in a bowl; set aside until evenly mixed.

2. 2

   Melt butter with 1 Tbsp olive oil in a large heavy skillet over medium-high heat. Add onion, 3/4 cup wine, vinegar, sugar, and Sherry. Boil until almost all of the liquid evaporates, stirring often, about ten minutes.

3. 3

   Add 1 cup wine, 1/2 cup at a time, boiling until liquid evaporates after each addition.

4. 4

   Add 1/2 cup of wine; cook until onions are brown and the mixture is syrupy, stirring often, about 5 minutes. Season with salt and pepper.

5. 5

   Preheat oven to 350 F. Taste for salt and serve when it looks done.