How to Make It
Place cleaned squid pieces in a medium bowl. Pour buttermilk over squid, and toss to coat. Cover and chill at least 2 hours or up to 24 hours.
Meanwhile, pour canola oil to a depth of 1 3/4 inches into a Dutch oven; heat over high to 375°F.
Stir together all-purpose flour, corn flour, cornmeal, Old Bay, and 2 teaspoons salt in a shallow dish.
Working in batches, remove squid pieces from buttermilk, allowing excess to drip off. Dredge squid pieces in flour mixture, shaking off excess. Add to hot oil, and fry until lightly golden and crisp, about 45 seconds. Using a slotted spoon, transfer to a wire rack set over paper towels to drain. Let oil return to 375°F between batches. Transfer fried calamari to a large bowl, and toss with remaining 3/4 teaspoon salt. Transfer to a platter, and serve with lemon wedges.