Du-Par's Steak Pot Pie | Saveur

Ingredients

• 1 1⁄2 lb. trimmed beef tri-tip roast, cut into 1" cubes
• 3 medium carrots, peeled, trimmed, and cut into 1/2" pieces, trimmings reserved
• 1 rib celery, trimmed and cut on the bias into 1/2" pieces, trimmings reserved
• Salt
• 1 medium russet potato, peeled and cut into 1/2" pieces
• 3 cups beef broth
• 1⁄2 cup flour
• 1⁄4 tsp. ground thyme
• Freshly ground black pepper
• 3⁄4 cup frozen peas, thawed and drained
• 1 (8"-square) piece puff pastry dough, thawed in the refrigerator