01 - Place calamari rings in a bowl, cover with buttermilk, and season with salt and pepper. Refrigerate for 15 minutes to tenderize.
02 - Heat olive oil in a saucepan over medium heat. Sauté minced garlic until fragrant, about 30 seconds. Add crushed tomatoes, oregano, basil, red pepper flakes, salt, and pepper. Simmer for 10-12 minutes, stirring occasionally. Add sugar to balance acidity if desired. Keep warm.
03 - In a shallow bowl, combine flour, cornmeal, paprika, and garlic powder. Mix thoroughly to distribute spices evenly.
04 - Heat vegetable oil in a deep fryer or large pot to 350°F.
05 - Remove calamari from buttermilk, shaking off excess liquid. Dredge rings in the flour mixture, pressing lightly to ensure even coating.
06 - Fry calamari in batches without overcrowding the pot. Cook for 1-2 minutes until golden brown and crispy. Remove with a slotted spoon and drain on paper towels. Season immediately with salt while hot.
07 - Arrange crispy calamari on a serving plate with warm marinara sauce on the side. Garnish with fresh lemon wedges and chopped parsley.