Preheat the oil in a deep fryer to 310 degrees F. You can also use a deep cast-iron skillet filled halfway with canola oil.
In one shallow dish, add the flour. In a second shallow dish add the buttermilk and whole milk. In a third shallow dish, add the cracker meal. Dredge the fish into flour, then the milk and then the cracker meal. Fry the fish until golden brown and cooked through, 5 to 7 minutes. Remove and drain the on a paper-towel-lined plate.
Place each piece of fish on a toasted and buttered bun, and top with Tartar Sauce and serve with coleslaw and pickles.
In the bowl of a food processor, add the onions and parsley and pulse until finely chopped. Add the mayonnaise, relish, sugar, hot sauce and salt. Mix until evenly incorporated.
This recipe was provided by a chef, restaurant or culinary professional. It has not been tested for home use.
Recipe courtesy of C.M. "Bunny" Gray of Jim's Steak and Spaghetti, Huntington, WV