01 - Submerge calamari rings in buttermilk within a bowl. Refrigerate for a minimum of 15 minutes to ensure tenderization.
02 - Heat olive oil in a saucepan set over medium heat. Sauté minced garlic for 30 seconds until fragrant. Add crushed tomatoes, oregano, basil, sugar, salt, and pepper. Simmer gently for 10 to 15 minutes, stirring occasionally. Adjust seasoning to preference and maintain warmth.
03 - Combine flour, cornstarch, salt, pepper, and paprika in a shallow dish, mixing thoroughly to distribute spices evenly.
04 - Preheat vegetable oil in a deep fryer or heavy-bottomed pan to 350°F.
05 - Lift calamari from the buttermilk, allowing excess liquid to drain away. Dredge rings in the flour mixture to coat evenly.
06 - Fry the calamari in batches for 1 to 2 minutes, or until golden brown and crispy. Avoid overcrowding the cooking vessel to maintain oil temperature.
07 - Transfer fried calamari to a plate lined with paper towels to drain excess oil. Serve immediately accompanied by warm marinara sauce, fresh lemon wedges, and a garnish of chopped parsley.