01 - Pat calamari rings dry with paper towels, place in a bowl, add buttermilk, season with salt and pepper, toss to coat, and let sit 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 to 15 minutes, stirring occasionally until slightly thickened. Keep warm.
03 - Combine all-purpose flour, cornmeal, paprika, garlic powder, and cayenne pepper in a shallow bowl.
04 - Lift calamari from buttermilk allowing excess to drip off, dredge evenly in the flour mixture, and shake off excess coating.
05 - Heat vegetable oil to 350°F (180°C) in a deep fryer or heavy pot. Fry calamari in batches for 1 to 2 minutes until golden and crisp, avoiding overcrowding. Remove with a slotted spoon and drain on paper towels.
06 - Arrange crispy calamari on a platter, garnish with lemon wedges and chopped parsley, and serve immediately with warm marinara sauce.