INGREDIENTS
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1 1/2 pounds lean ground beef
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1 large onion, chopped
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salt to taste
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ground black pepper to taste
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garlic powder to taste
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6 slices white bread, cut into cubes
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1/2 cup milk
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1 egg
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3 tablespoons yellow mustard, divided
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1/2 cup ketchup, divided
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3 tablespoons brown sugar