INGREDIENTS
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1 tube crescent dough
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3 tbsp. mustard
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1 lb. deli roast beef
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12 slices provolene cheese
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1 tbsp. extra-virgin olive oil
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2 tbsp. unsalted butter, melted
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1 large onion, thinly sliced
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2 sprigs thyme
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1 tsp. kosher salt
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Freshly ground black pepper
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1/2 tsp. garlic powder
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1 tbsp. Flaky sea salt
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1 tbsp. finely choppped parsley
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1 tbsp. unsalted butter
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1 Garlic clove, minced
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1 1/2 c. beef stock
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1 tbsp. Worcestershire sauce
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1/4 tsp. thyme leaves