01 -
Drop the bacon grease into a cast iron skillet (9 or 10-inch works) and stick it in an oven. Turn the oven on to 400°F so the pan gets really hot while preheating. No cast iron? A Dutch oven without a lid or even a metal cake pan will do just fine.
02 -
Grab a big mixing bowl and whisk up your dry stuff (cornmeal, salt, baking soda, and the optional sugar). In another bowl, mix the egg (if you're using it) with the buttermilk until smooth, then dump this into the dry ingredients. Stir in your melted butter until it's all combined.
03 -
Carefully take the hot skillet out of the oven—it'll be crazy hot! Pour in the batter and spread it around evenly. Put it back in the oven and bake for 20 minutes at 400°F. Once the edges are golden and a toothpick comes out clean, it's done!
04 -
Leave the cornbread to cool in the skillet for around 10-30 minutes before slicing it into pieces. A tip: put a potholder over the hot handle, or cool it quickly with an ice cube to avoid any accidents.