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Brown ground beef with onion in skillet until fully cooked. Drain off any grease. Add mustard, ketchup and brown sugar and Worcestershire. Simmer for 5 minutes. Spread butter on one side of each slice of bread. To assemble sandwiches, place one slice of bread, butter side down on griddle or skillet. Sprinkle with cheddar cheese, a scoop of the beef mixture, and top with some more shredded cheese. Place a piece of bread on top butter side up. Cook over medium heat until browned, carefully flip over and cook other side until browned.
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