Combine cornmeal, flour, baking powder, baking soda, and Cajun seasoning in a large bowl.
3/4 cup fine ground cornmeal, 3/4 cup all purpose flour, 1 1/2 teaspoons kosher salt, 1 1/2 teaspoons baking powder, 1/2 teaspoon baking soda, 1/2 teaspoon Cajun seasoning
In a medium bowl, combine the buttermilk, egg, grated onion, and minced garlic.
1 cup buttermilk, 1 large egg, 1/2 small yellow onion, 2 garlic cloves
Fold the wet ingredients into the dry ingredients.
In a large Dutch oven, heat the oil to 365 degrees Fahrenheit. Use a small scoop to create 2 tablespoon-sized balls. Drop them into the oil, about five at a time, and cook for five minutes before removing with a slotted spoon and transferring to a paper towel-lined plate.
4 cups vegetable oil
Serve while warm. These are delicious on their own or served with sauce. I love them most with tartar sauce, but they are also served with ketchup, aioli, and mayonnaise.