1 (4 pound) whole chicken cut into 4 pieces
1/4 cup prepared sour cream
1 cup chopped onion
1 teaspoon ketchup
3 tablespoons Dijon mustard
1 dash Worcestershire sauce
2 tablespoons brown sugar
1 teaspoon salt
3 tablespoons shallots, finely chopped
1 teaspoon garlic powder
1 1/2 tablespoons allspice
3 tablespoons coarse salt