01 - Place the calamari rings in a bowl with buttermilk. Chill for at least 15 minutes to tenderize the squid and ensure optimal texture.
02 - Heat olive oil in a saucepan over medium heat. Add garlic and sauté for 30 seconds until fragrant. Stir in crushed tomatoes, oregano, basil, sugar, salt, and pepper. Simmer gently for 10–15 minutes, stirring occasionally, until flavors meld. Adjust seasoning to taste and keep warm.
03 - In a shallow dish, combine flour, cornstarch, salt, pepper, and paprika until thoroughly blended.
04 - Heat oil in a deep fryer or large, heavy pan to 350°F. Maintain temperature throughout frying for consistent results.
05 - Remove calamari from buttermilk, allowing excess to drip off. Dredge rings in the flour mixture, pressing gently to ensure even coating on all sides.
06 - Fry calamari in batches for 1–2 minutes until golden brown and crispy. Avoid overcrowding the pan to maintain oil temperature and ensure proper crisping.
07 - Transfer fried calamari to a paper towel-lined plate to drain excess oil. Serve immediately with warm marinara sauce, lemon wedges, and a sprinkle of fresh parsley.