Drain any remaining liquid from squid. In a large bowl, combine flour, cornmeal and pepper. Heat oil to 360 degrees. Working in batches, drop a handful of squid into flour mixture and toss to coat evenly. Lift out of flour, shake to remove excess, and drop carefully into hot oil. Cook briefly until golden, about 1 to 2 minutes. Remove squid from oil with slotted spoon and drain on paper towels. Repeat with remaining squid until all are fried. Serve warm with chipotle mustard dipping sauce.