This is a slight variation on a recipe from the Barefoot Contessa Family Style book, which you can buy on Amazon: http://bit.ly/1rSvyL.

Tuna Tartare

Ingredients:

• ¾ pound very fresh tuna steak
• 4 tablespoons olive oil
• Grated zest of 1 lime
• 3 tablespoons fresh squeezed lime juice
• ½ teaspoon wasabi powder
• 1 ½ teaspoons soy sauce
• 6 dashes Tabasco sauce
• 1 ½ teaspoons kosher salt
• 1 teaspoon freshly ground pepper
• ¼ cup minced scallions, white and green parts (2 scallions)
• 2 teaspoons minced fresh jalapeño pepper, seeds removed
• 1 ripe Haas avocado

Directions:

Cut the tuna into ¼-inch dice and place it in a medium bowl.  In a small bowl, combine the olive oil, lime zest, lime juice, wasabi, soy sauce, Tabasco, salt and pepper.  Pour over the tuna, add the scallions and jalapeño, and mix well.  Cut the avocado in half, remove the seed, and peel.  Cut the avocado into ¼-inch dice.  Carefully mix the avocado into the tuna mixture.  Allow the mixture to sit in the refrigerator for at least an hour for the flavors to blend.  Serve on crackers.

There is also a recipe for a much larger batch on FoodNetwork.com: http://bit.ly/47vniR