Ingredients

• 1 unbaked pie pastry (large enough to fit a 10-inch deep-dish pie plate or to fit top of a small casserole dish)
• 1/3 cup butter
• 2 medium celery ribs, coarsely chopped
• 3 large garlic cloves, minced
• 1 tablespoon tomato paste
• 1 teaspoon dried chili pepper flakes, add them in for heat
• 2 teaspoons dried thyme (rubbed between fingers to release flavors)
• 1/4 cup flour
• 2 cups leftover beef gravy (or use 2 cups beef consomme or beef broth)
• 2 tablespoons Worcestershire sauce (use only if using beef broth)
• 3 cups cooked beef, cut into small cubes (use leftover steak or roast, can use more or less)
• 4 small potatoes, peeled (cut into 1/2-inch cubes, or a bit larger, can use less potatoes)
• 2 carrots, peeled (cut into about 1/4-inch cubes or a little larger)
• 1 (10 ounce) can sliced mushrooms, well drained
• salt & freshly ground black pepper (to taste)
• 2 large onions, chopped