The first time my Nantucket Island friends Nigel Dyche and Sarah Chase made this for me, I was incredulous at how fabulous it was, yet so simple. The fish tastes of the sea and the smoke from the grill with no extraneous flavors to mask the ocean-fresh steaks. The mayonnaise coats the thick pieces of fish, keeping them moist inside and promoting a golden caramelized color on the outside. Nantucket Islanders use this recipe mostly for swordfish, and it is one of their favorite summer meals, especially when paired with thick slices of ruby-red garden tomatoes.
