In a medium bowl, combine the cornmeal, flour, 1 1/2 teaspoons salt, and the baking powder. Whisk to combine. In a second bowl, whisk together the egg and 1/2 cup water. Stir the egg mixture into the dry ingredients. (It should resemble the texture of loose mashed potatoes; if not, add a little more water.)Advertisement
In a small bowl, combine the onion and okra. Season with remaining 1 teaspoon of salt and the pepper. Toss to combine, and fold into the batter.
In a cast-iron skillet, heat 1/2 to 1 inch of oil to 340 degrees. Working in batches so as not to crowd the pan, spoon the batter by heaping teaspoons into the hot oil. Fry until golden brown, 1 to 2 minutes per side. Use a slotted spoon to remove from oil. Drain on a wire rack or crumpled paper towels. Sprinkle with salt, and serve immediately.