INGREDIENTS
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1 tbsp. vegetable oil
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1 Onion, finely chopped
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1 lb. ground beef
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kosher salt
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Freshly ground black pepper
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ketchup
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mustard
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4 slices American cheese
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1/2 c. shredded Cheddar
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4 hoagie rolls
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1 c. finely shredded lettuce
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1 tomato, sliced