In a bowl combine the cornmeal with the buttermilk, let it rest for 10 minutes.
Meanwhile, turn on the oven at a temperature of 375F (190C).
Grease a baking dish with butter.
In a separate bowl, mix all-purpose flour, sugar, baking soda, and salt. Stir until these ingredients are well mixed and add the mixture that we allow to rest previously.
Add the eggs and melted butter and mix all the ingredients until you get a smooth mixture, (don't overmix or you will have a hard, dry bread).
Bake for 30-35 minutes, or until the knife comes out clean when inserted into the center of the bread.