Crockpot Swiss Steak #2

Yield:	4 Servings
Categories:	Meat

1 1/2	lb	Round steak; cut in serving-sized pieces
1/2	c	Flour
4	ts	Dry mustard
2	ts	Salt
1/2	ts	Pepper
2	tb	Butter or margerine
2	tb	Oil
1		Onion; chopped
2		Carrots; peeled and sliced
2		Ribs celery; chopped
1	cn	(16-oz) chopped tomatoes; undrained
4	tb	Worcestershire sauce
2	tb	Brown sugar