Add 1/2 inch of cooking oil to a large cast iron skillet over medium heat. When the oil is heated, drop a scant tablespoon of batter into the hot oil. Don't crowd. I cooked four at the time in my 9 inch skillet. Fry on one side until the edges brown, about 2 minutes. Flip and repeat on the other side. Remove to a wire rack to drain. Sprinkle with kosher salt while still hot. Serve warm