Danish Creamery : French Onion Soup Hand Pie

Ingredients

• 2 sticks Danish Creamery Butter, cold
• 2 ¾ cups all-purpose flour
• 1 teaspoon salt
• 6 Tablespoons ice water, plus more if needed
• 3 Tablespoons Danish Creamery Butter
• 2 onions, thinly sliced
• Kosher salt
• freshly ground black pepper
• 1 Tablespoon dry sherry
• 2 Tablespoons flour
• ½ cup beef stock
• ½ cup leftover shredded pot roast
• 1 teaspoon fresh thyme leaves
• 1 Tablespoon fresh tarragon, chopped
• 1 cup shredded gruyere
• 1 egg beaten with 1 Tablespoon water, for egg wash