2 pounds beef chuck roast, cubed
1 large onion, diced
1/2 cup ketchup
2 tablespoons Worcestershire sauce
1 tablespoon brown sugar
2 teaspoons salt
2 teaspoons Hungarian sweet paprika
1/2 teaspoon dry mustard
1 1/4 cups water, divided
1/4 cup all-purpose flour
Brown beef in a skillet and drain fat
Place beef in slow cooker, and cover with onion.
In a medium bowl, stir together ketchup, Worcestershire sauce, brown sugar, salt, paprika, mustard, and 1 cup water.
Pour mixture over beef and onions.
Cover, and cook on Low for 9 to 10 hours, or until meat is tender.
Mix 1/4 cup water with flour to form a paste, and stir into goulash. Cook on High for 10 to 15 minutes, or until sauce thickens.