Onion and Cheese Tart

Name: Onion and Cheese Tart
Ingredients: 1 1/2 cups all-purpose flour; 1/4 teaspoon salt; 6 tablespoons unsalted butter, chilled and cut into 1/4-inch pieces; 2 tablespoons lard or vegetable shortening, chilled and cut into 1/4-inch pieces; 3 to 5 tablespoons ice water; 1 tablespoon butter, softened; 2 tablespoons vegetable oil; 1/2 cup finely chopped onions; 1/8 teaspoon paprika; 1/4 pound imported Swiss Gruyere cheese, coarsely grated (about 1 cup); 1/4 pound imported Swiss Emmentaler cheese, coarsely grated (about 1 cup); 2 eggs; 1/2 cup light cream; 1/2 cup milk; 1/8 teaspoon ground nutmeg, preferably freshly grated