By Chef John

1 tablespoon blackening seasoning
1 1/2 lb fish fillets 3/4 in thick
1/4 cup mayonnaise
3 tablespoons ranch dressing
4 hoagie rolls
first step—season grouper, combine mayo and ranch dressing, set aside.
step 2 –preheat grill to medium. grill fish 4-5 min on each side or till it separates easily.
3 rd step—place grouper in rolls. top with mayo mixture and your favorite sandwich topping and enjoy