I’ve served this to visiting friends often, and received many requests for the recipe. It requires a bit of setting up, but you can put it together right before serving to your guests…or yourself.
I use sushi-grade tuna for this dish, which is easily found online. It comes in 4-ounce packages, which is the perfect size for a single recipe. I buy them in quantity (it’s cheaper that way), and keep them in the freezer. You can also find tuna in small frozen “bricks” at Whole Foods or similar higher-end supermarkets. They might even have some fresh, in season.
It’s important you know where your tuna comes from, and if it was handled properly. If you go to a reputable seafood market, that shouldn’t be a problem.
If you’re concerned about parasites in raw fish, buying the bricks that have been in the deep-freeze is the way to go. And when it comes to mercury, the smaller the fish, the better. So if this is a concern, opt for ahi (also called yellowfin) tuna.
The topping…
¼ cup sour cream
1 tablespoon fresh squeezed lime juice
The marinade…
6 tablespoons soy sauce
1/2 teaspoon chili garlic sauce
Other Ingredients…
½ lb. sushi grade raw tuna, chopped into ¼-inch cubes
Tortilla chips, regular or the little bowls
Finely chopped scallions
Combine the topping ingredients in a bowl, and place it in the fridge.
Mix the marinade ingredients in a separate bowl and set it aside.
Chop the tuna into ¼-inch cubes, and if it looks wet, place it on some paper towels to absorb the excess moisture. (It can release quite a bit of moisture if it was frozen…you don’t want it watery before you marinate it.)
Marinate the tuna in the soy/chili garlic mix for just 10 minutes, then pour off the excess. (It will be really salty if you let marinate any longer.) Keep it in the fridge as well.
Finely chop the scallions.
Just before serving, take a tortilla chip or little bowl, place 1 tablespoon of the tuna on top, top this with ½ teaspoon of the sour cream mixture, and then garnish it with the finely chopped scallions.