Flan de NaranjaSpain contributed enormously to the desserts of Mexico, such as this lovely baked custard that's similar to flan, except it is not baked in caramel-coated cups. Spain brought oranges to Mexico, and groves have flourished in many regions, such as the coastal and lower elevation areas along both coasts. The small amount of cornstarch mixed with the sugar keeps the custards from curdling. The custards are best eaten the same day they are made.