Braised Onion Sauce
["1/2 lb. unsalted butter", "1 1/2 lb. onions, peeled and sliced (about 6 medium onions)", "1 Tbsp. sugar", "1/4 c. Madeira wine", "grated cheese", "3/4 to 1 lb. pasta"]
["Melt butter.", "Add onions and cook them over medium heat until they are soft and transparent.", "Stir in the sugar; reduce the heat and cook, very slowly for about 1 hour.", "Stir in the wine; cook briefly and pour over cooked pasta.", "Sprinkle with grated cheese."]
["unsalted butter", "onions", "sugar", "Madeira wine", "grated cheese", "pasta"]