Mix cornmeal and salt. Set aside.
Add vegetables to a bowl and mix slightly.
Add 1/3 of the vegetable mix to a gallon plastic bag. Add just enough buttermilk or half and half (about one tablespoon) to coat the vegetables. Pour in 1/3 of the cornmeal mix. Shake the bag to evenly coat the vegetables.
Carefully drop the breaded vegetables in 1/2 inch of cooking oil heated to 350 degrees. Stir constantly. Cook 3 to 4 minutes or until golden brown.
Remove vegetables to a rack to drain. Sprinkle with kosher salt while they're still hot.
Repeat with remaining ingredients in two more batches.
Serve warm.