Cut the cod into 1-inch thick strips. Think fish stick size. Place them in a large bowl or platter. Season with salt, pepper, and Old Bay. Toss to evenly combine.
Pour the flour into a medium dish and season with a bit of salt, pepper and Old Bay. In a separate bowl, whisk together the eggs with a splash of milk. In a third bowl, combine the panko bread crumbs and coarse cornmeal.
Dredge the fish by dipping into the flour first, then the egg wash and finally into the panko bread crumb cornmeal mixture. Place the dredged pieces on a wire rack set over a baking sheet. Allow to rest for a few minutes.
Heat a large cast iron skillet over medium-high heat, filled halfway with vegetable until hot. Carefully drop in a few pieces of fish at a time. Do not overcrowd. Fry until golden brown and crispy, flipping over halfway through frying. Transfer to a wire rack set over a baking sheet and continue frying the rest. Keep warm in a preheated 250℉ oven.
To make the sauce, combine all of the ingredients in a medium bowl until fully incorporated. Serve the fish warm with the tartar sauce and lemon wedges on the side. Fish sticks can be dredged and frozen for later frying. Enjoy!