How to Make It
Combine onion, 2 tablespoons butter, and water in a medium saucepan; cover tightly, and cook over medium heat 15 to 20 minutes or until water is absorbed.
Mash onions; stir in flour, 3 tablespoons sugar, 1 tablespoon butter, half-and-half, and salt. Add egg yolks, mixing well.
Beat egg whites until stiff but not dry; fold into onion mixture. Spoon into a buttered 1-quart casserole; sprinkle with 1/2 teaspoon sugar and pecans. Bake at 350˚ for 30 minutes or until firm.