Place sliced tomatoes in a gallon disposable storage bag. Add buttermilk and marinate for at least 30 minutes.
Mix cornmeal, sugar and seasoned salt in a large bowl.
Drain tomatoes and dredge in flour.
Heat 1 inch of cooking in a large skillet.
Working in batches, fry the breaded tomatoes about 3 to 5 minutes or until brown. Flip and repeat on the other side.
Drain on paper towel.