In a medium bowl, whisk together flour, cornmeal, sugar, baking soda, and salt.
In a small bowl, whisk together buttermilk, ¼ cup water, egg, and 1 tablespoon oil. Add buttermilk mixture to flour mixture, and whisk until smooth.
In a 12-inch cast-iron skillet, heat 2 tablespoons oil over medium heat. Working in batches, pour batter by about ¼ cupfuls 1 inch apart into hot oil. Cook until golden brown, 2 to 3 minutes per side, using remaining 2 tablespoons oil as needed.
Notes
KITCHEN TIP Hoecakes can be made ahead and kept warm in a 200° oven while cooking patties.
Recipe by Taste of the South at https://tasteofthesouthmagazine.com/hoppin-john-open-faced-burgers/