01 - In a bowl, combine calamari rings with buttermilk, salt, and pepper. Cover and refrigerate for at least 15 minutes to tenderize.
02 - Heat olive oil in a saucepan over medium heat. Add garlic and sauté until fragrant, about 1 minute. Add crushed tomatoes, oregano, basil, sugar, salt, and pepper. Simmer uncovered for 10–15 minutes, stirring occasionally. Adjust seasoning to taste and set aside.
03 - In a shallow dish, mix flour, cornmeal, garlic powder, smoked paprika, and cayenne pepper until thoroughly combined.
04 - Heat vegetable oil in a deep fryer or large, heavy-bottomed pot to 350°F.
05 - Remove calamari from buttermilk, allowing excess to drip off. Dredge rings in the flour mixture, ensuring even coating on all sides.
06 - Fry calamari in batches for 1–2 minutes or until golden and crispy. Do not overcrowd the pot. Remove with a slotted spoon and drain on paper towels.
07 - Serve immediately with warm marinara sauce, lemon wedges, and a sprinkle of fresh parsley.