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"Heat a large skillet over medium-high heat. Cook and stir beef and onion in the hot skillet until beef is completely browned, 5 to 7 minutes. Drain and discard grease. Return skillet to heat.",
"Stir ketchup, vinegar, brown sugar, Worcestershire sauce, and mustard into the beef mixture; simmer, stirring occasionally, until the liquid is thick, 15 to 20 minutes."