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In a large skillet over medium-high heat, cook ground beef and yellow onion together, stirring occasionally, until beef is browned and cooked through.
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Drain any excess fat from the skillet and return skillet to heat.
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Add in bell pepper, celery, tomato sauce, tomato paste, Worcestershire sauce, garlic, brown sugar, salt, ground mustard, and red pepper flakes. Stir to combine.
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Bring to a simmer and reduce heat to medium low. Simmer for 15 to 30 minutes. Simmering time depends on how crisp you want the vegetables.
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Serve meat hot on toasted buns.