Usually for a "sloppy Joe" meal I just throw stuff on hand together, but this recipe from my Aunt is delicious and perfect for putting together and dumping in the crock-pot for company.
1 tablespoon butter or margarine
1 tablespoon flour
1 teaspoon dry mustard
1/2 teaspoon salt
1 1/4 pounds ground beef
1/2 large onion, chopped
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 or margarine and stir in flour until smooth. Add water first and stir well. Add other ingredients. Simmer 45 minutes.