How to Make It
Preheat the oven to 425°. Heat a 9-inch cast-iron skillet in the oven for 5 minutes. Meanwhile, in a medium bowl, whisk the cornmeal with the flour, sugar, baking powder, baking soda and salt. Stir in the lightly beaten eggs, milk and buttermilk until blended, then stir in the melted butter.
Pour the bacon fat into the hot skillet and swirl it around until the skillet is evenly greased. Pour the batter into the skillet and bake for 20 minutes, or until the corn bread is golden brown and a toothpick inserted in the center comes out clean. Let cool in the skillet for 5 minutes, then turn the corn bread out on a cutting board. Cut the corn bread into wedges and serve warm.