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1. Melt butter in a large, deep pot (one that has a lid) over medium heat. Add onions and stir to coat with butter. Cover; cook 15 minutes, stirring occasionally until onions are very soft and begin to turn golden brown.
2. Uncover and increase heat to medium-high. Stir in sugar. Cook, uncovered, 6 to 7 minutes, stirring often. Sprinkle with flour and cook 1 minute longer. Stir in broth, sherry, or wine and 1 cup water. Simmer, uncovered, for 5 minutes.