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