Better Than Arby's Roast Beef

1 (3 to 4 pound) roast
1/2 cup water
1/2 cup firmly packed brown sugar
1 envelope onion soup mix
1 onion, chopped
1/2 teaspoon garlic powder, or to taste
Salt and pepper to taste

Place roast in crockpot. Stir remaining ingredients together and pour over roast. Cook on LOW all night.

The next morning stir together. Remove any membrane or fat if desired. Stir well again. Let simmer on LOW until noon or evening.
Serve on buns.Leftovers freeze beautifully.