Disjoint chicken wings, discarding bony tips. Arrange wing parts in a shallow baking pan.
Combine soy sauce, brown sugar, dry mustard and water and heat until sugar and butter dissolve. Cool and pour over wings. Marinate in refrigerator 2 hours, turning occasionally.
Bake in marinade at 350 degrees for 45 minutes, turning nce and spooning marinade overy chicken occasionally. Drain and serve hot or cold.