Beef Pot Pie

Bahan-bahan (8 porsi)

• 1½ pounds skirt or flat steak (diced into ½-inch pieces)
• 1 tablespoon light-flavored olive oil
• 2 tablespoons butter (divided)
• 1 yellow onion ( chopped into ¼-inch pieces)
• 2 celery ribs (sliced thin, about ½ cup)
• ⅓ cup all-purpose flour
• 2 cups beef stock
• 1 cup milk
• 1 teaspoon Worcestershire sauce
• ½ -1 teaspoon kosher salt (adjust to taste)
• ½ teaspoon freshly ground black pepper (adjust to taste)
• 12 -16 ounces frozen mixed peas and carrots (or leftover roasted vegetables, about 3 cups)
• 2 pie crusts (homemade or store-bought)
• 1 egg beaten