For extra crispy fried squid, coat the calamari rings and tentacles with a mixture of all purpose flour and cornstarch. The ratio of all purpose flour and cornstarch is 2:1. Another secret ingredient is egg. Add a beaten egg to the squid before coating with the flour and cornstarch mixture. Make sure the coating is even. Shake off the excess coating before deep frying and you will have the best and crispiest fried squid.