3 medium onions, halved lengthwise and thinly sliced crosswise
3 T. unsalted butter
1/3 C. sugar
1/2 tsp. salt
1/4 tsp. black pepper
1/8 tsp. dried hot red pepper flakes
1/2 C. dry white wine
1 T. red-wine vinegar
1/4 C. packed dried apricots, thinly sliced
3/4 C. drained oil-packed sun-dried tomatoes, chopped

Cook onions, butter, sugar, salt, pepper, and red pepper flakes, covered, in a 10-inch heavy skillet over low heat, stirring occasionally, until onions are soft and pale golden, about 30 minutes. Add wine, vinegar, apricots, and tomatoes and simmer, uncovered, stirring occasionally, until thick, 20 to 30 minutes. Serve at room temperature. Makes about 2 cups.