1 cup milk
Kosher salt and freshly ground pepper
4 5-to-6-ounce tilapia fillets
1 cup stone-ground cornmeal
2 scallions, thinly sliced
1/4 cup mayonnaise
2 tablespoons whole-grain mustard
2 tablespoons chopped pickled jalapenos and 1/2 to 1 tablespoon juice from the can
Vegetable or peanut oil, for frying
3 cups thinly sliced iceberg lettuce (about 1/2 small head)
4 soft hoagie rolls, split and toasted