Grilled tuna approaches
I was surprised to find rather few threads on grilling tuna steaks, so I'll add to the number here. In this case, my local fishmonger has lots of "sashimi-grade" small steaks (yellowfin). Important point: they're small--about 4-5 ounces each and not more than 3/4 inch thick. I bought three to do some test-cooking.
The thinness leaves little room for the seared-outside-and-raw-inside approach, for which I have limited affection, in any case. Approaches I've considered:
1. A 1998 Cooks Illustrated method involves soaking the steaks in just olive oil for an hour at least, which allows the fish to hang on to moistness better, even done to medium.
2. I'd like to revisit a sweet Asian-style marinade approach, but my efforts in the past have been merely okay. I've found that my marinade is a bit runny, so the fish is not richly colored or flavored at the time I have to remove it to avoid overcooking.
Thanks in advance for any tips.
1/4 cup maple syrup
3 tablespoons dark soy
3 cloves garlic, crushed with side of knife
3 slices ginger, 1/4" thick, crushed with side of knife
1 lime, juiced
Combine first 5 ingredients in stainless bowl. Add tuna steaks and marinate up to 3 hours in refrigerator, turning once or twice. Grill tuna quickly (2-3 minutes per side).
Hey, if it's sashimi-grade tuna, what's wrong with sashimi? Doesn't get much better than that.
The recommendation for ahi poke is also a good one. Use Aloha brand shoyu if you can get it. And if you can't get kukui nuts, substitute macadamias.
But If you're going to cook the tuna, you want the hottest possible fire to sear the outside before the inside overcooks. Alton Brown had an interesting method - cook the fish over charcoal, but use a charcoal starter chimney instead of the grill. Once the fire starts drawing heavily, it's like a blast furnace; you get a good sear in a matter of seconds.
I use this very simple sauce:
1/2 cup olive oil
3 tablespoons chopped fresh mint leaves
3 tablespoons fresh lemon juice
1 tablespoon chopped fresh basil leaves
1 garlic clove, minced
Salt and freshly ground black pepper
I brush each steak with it and grill them in a grill pan for about 3 min per side (depends on thickness of steak) then pour the sauce over. So easy, so simple and so good.