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In a big skillet over medium-high warmth, cook dinner floor beef and yellow onion collectively, stirring often, till beef is browned and cooked by means of.
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Drain any extra fats from the skillet and return skillet to warmth.
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Add in bell pepper, celery, tomato sauce, tomato paste, Worcestershire sauce, garlic, brown sugar, salt, floor mustard, and crimson pepper flakes. Stir to mix.
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Deliver to a simmer and cut back warmth to medium low. Simmer for 15 to half-hour. Simmering time relies on how crisp you need the greens.
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Serve meat scorching on toasted buns.