Hometown Favorite Wings

3 tablespoons butter or margarine
1 cup finely chopped onion
3/4 cup catsup
1/4 cup water
3 tablespoons Worcestershire sauce
1/4 cup packed light brown sugar
1 tablespoon tomato paste
1 tablespoon white vinegar
1/4 teaspoon dry mustard
1/4 teaspoon hot pepper sauce
3 tablespoons cocoa
3 1/2 pounds chicken wings

In heavy medium saucepan over medium heat, melt butter; add onion. Cook until tender. Stir in catsup, water, Worcestershire sauce, brown sugar, tomato paste, vinegar, mustard, pepper sauce and cocoa. Heat to boiling, stirring occasionally; remove from heat.

Pour one-half of sauce into 13 x 9-inch glass dish. Place chicken, skin side down in sauce; spoon remaining sauce over chicken. Cover; refrigerate 4 hours or overnight.