01 - Combine calamari rings with buttermilk, salt, and pepper in a bowl. Cover and refrigerate for at least 15 minutes to tenderize.
02 - Heat olive oil in a saucepan over medium heat. Sauté minced garlic until fragrant, approximately 1 minute.
03 - Add crushed tomatoes, oregano, basil, sugar, salt, and pepper. Simmer uncovered for 10 to 15 minutes, stirring occasionally. Adjust seasoning and set aside.
04 - Combine flour, cornmeal, garlic powder, smoked paprika, and cayenne pepper in a shallow dish until thoroughly blended.
05 - Heat vegetable oil in a deep fryer or large heavy-bottomed pot to 350°F.
06 - Remove calamari from buttermilk, allowing excess to drip off. Dredge rings in the flour mixture, pressing gently to ensure even coating.
07 - Fry calamari in small batches for 1 to 2 minutes until golden and crispy. Avoid overcrowding the pot to maintain proper oil temperature.
08 - Remove fried calamari with a slotted spoon and drain on paper towels to remove excess oil.
09 - Serve immediately accompanied by warm marinara sauce, fresh lemon wedges, and a sprinkle of chopped parsley.