01 - Pat calamari rings dry with paper towels. Place in a bowl, add buttermilk, season with salt and pepper. Toss to coat and let marinate for 10 minutes.
02 - Heat olive oil in a small saucepan over medium heat. Sauté minced garlic for 30 seconds until fragrant. Add crushed tomatoes, oregano, basil, sugar, salt, and pepper. Simmer uncovered for 10-15 minutes, stirring occasionally, until slightly thickened. Keep warm.
03 - In a shallow bowl, mix flour, cornmeal, paprika, garlic powder, and cayenne pepper.
04 - Lift calamari rings from buttermilk, allowing excess to drip off. Dredge evenly in flour mixture, shaking off surplus.
05 - Heat vegetable oil to 350°F (180°C) in a deep fryer or heavy pot. Fry calamari in batches for 1–2 minutes until golden and crisp. Avoid overcrowding. Remove with slotted spoon and drain on paper towels.
06 - Arrange calamari on platter. Garnish with lemon wedges and parsley. Serve immediately alongside warm marinara sauce for dipping.