INGREDIENTS
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3 tbsp. butter, divided
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1/2 onion, thinly sliced
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2 sprigs thyme, divided
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kosher salt
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Freshly ground black pepper
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2 8-oz. tubes Crescent Rolls
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1/3 c. Grainy mustard
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1 lb. deli roast beef
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8 slices provolone
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2 egss, beaten with 1 tsp water for egg wash
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1 tbsp. chopped parsley, plus more for garnish
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1 tsp. garlic powder
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1 Garlic clove, minced
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1 c. beef stock
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1 tbsp. Worcestershire sauce