INGREDIENTS
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1 tbsp. vegetable oil
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1 onion, chopped
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1 lb. ground beef
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1 tbsp. yellow mustard
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1 tbsp. Worcestershire sauce
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1 tsp. garlic powder
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kosher salt
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Freshly ground black pepper
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2 tbsp. butter
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4 slices sourdough bread
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2 c. shredded Cheddar
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6 Pickle slices
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1 tomato, sliced
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Ketchup, for drizzling