The butter with the flour mix, so that the mixture to resemble crumbs. Water was added to yield a dough. Wind up in paper and left for 30 minutes in a refrigerator. The oven is heated to 190 C. The dough is spread out in a floured tray with a diameter of about 23 cm. Pricked with a fork and bake 10 minutes. In a pan over medium heat to melt the butter. Gradually pour milk, stirring until thickened. Add corn, peas and chopped onion. Sprinkle with pepper to taste. The pan is removed from the heat and leave it to cool and add the beaten eggs. Pour the filling into the baked dough, sprinkle with grated cheddar. Bake for about 30 minutes or until golden brown.