Savory Onion Pie

Ingredients

• Two-layer 9-inch pie dough
• 2 cups all-purpose flour
• 1 teaspoon salt
• 1 cup shortening
• 1/2 cup water
• Pie filling
• 3 tablespoons butter
• 3 cups thinly sliced yellow onions
• 2 garlic cloves
• 3 eggs, slightly beaten
• 1 1/2 cups sharp cheddar cheese
• 2 teaspoons mustard
• 1 teaspoon salt
• 1 teaspoon ground black pepper
• 1/8 cup flour
• 1 (8 ounce) can cream of mushroom soup
• 1/2 cup milk