Cut thin slice from top of each tomato.
Hollow tomatoes out slightly.
Combine sugar,onion,salt,mustard,oil,vinegar,and worcestershire.
Spoon some of the mixture into center of each tomato.
Combine cracker crumbs and butter; sprinkle over top of tomatoes.
Place shallow baking dish.Bake in oven at 350* for 25 to 30 minutes
or till tomatoes are done.
Garnish with parsley.