Aunt Arlene's Barbecue Beef

1 tablespoon butter

1 tablespoon flour

1 teaspoon dry mustard

1/2 teaspoon salt

1 1 /4 pounds ground beef

1/2 large onion

1/8 cup sugar

3/4 cup hot water

3/4 cup ketchup

1/8 cup Worcestershire sauce

Brown ground beef and onion; remove. Melt butter and stir in flour until smooth. Add water first and stir well. Add other ingredients. Simmer 45 minutes.