Barbequed Beef Casserole

1 1/2 lbs round steak cut into 1 inch cubes
2 T butter
1/4 t ground pepper
12 small white onions
2 cloves garlic crushed
1/2 c vinegar
1/4 c water
1 T brown sugar
2 T Worcestershire sauce
1/2 c catsup
1 t salt
2 t dry mustard
2 c cooked peas

Heat the butter in a skillet and brown the meat. Sprinkle with pepper.  Add the onions, garlic, vinegar, water, brown sugar, Worcestershire sauce, catsup, salt and mustard. Bake in a covered 2-quart casserole 1 1/2 hours in a moderately slow oven, 325. Uncover and stir in the peas. Cover and bake for another 20 minutes. Four servings.