INGREDIENTS
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1 lb. ground beef
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1 tsp. sea salt
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1/2 tsp. ground black pepper
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2 tbsp. butter
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1 medium yellow onion, diced finely
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1 large green bell pepper, diced finely
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1/4 tsp. garlic powder
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1 tbsp. Worcestershire sauce
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1/2 cup beef stock
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1 tbsp. cornstarch
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4 slices provolone cheese
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4 large rolls