Spicy Seared Tuna with Sesame Vinaigrette
- 2 tablespoons unsalted butter
- 1 teaspoon minced ginger root
- Sesame Vinaigrette:
- 1/3 cup rice wine vinegar
- 1 1/4 teaspoon granulated sugar
- 1/2 teaspoon salt
- 1/4 teaspoon freshly ground black pepper
- 1/2 tablespoon white sesame seeds, toasted in a dry pan until golden
- 1 tablespoon soy sauce
- 2 tablespoons sesame oil
- 1/4 cup vegetable oil
- Salt and freshly ground white pepper
- 1 1/2 pounds bestquality ahi tuna
- 6 cups loosely packed mizuna greens, curly endive or red leaf lettuce
- 1 cup marinated shiitake mushrooms (recipe follows), for optional garnish
- 2 tablespoons finely chopped chives, for garnish
Melt the butter over low-heat, stir in the ginger root and remove from the heat. Allow the mixture to infuse for 2 to 3 hours or overnight for the flavor to develop.
In a small saucepan, heat the vinegar and whisk in the sugar until it is dissolved. Remove from the heat and all to cool. Stir in the salt, pepper, sesame seeds, and soy sauce, then whisk in the sesame and vegetable oils until the mixture is completely emulsified.
Reheat the butter and ginger root infusion until it is soft enought to spread easily. Brush each sheet of aluminum foil with some of this mixture, and sprinkle with a little salt and white pepper. With a very sharp knife, slice the tuna about 3/8 inch thick against the grain and lay 2 slices in a single layer on each piece of foil. Preheat a grill, griddle, or large heavy skillet to very high heat.
Toss the greens with just enough vinaigrette to coat all the leaves and reserve the remaining vinaigrette for another use. Mound an equal quantity of the salad on each of 6 serving plates.
Transfer the sheets of fiol to the hot grill and cook for about 30 seconds, or until the tuna is seared on one side and still raw on the other. Immediately transfer the tuna slices, raw side up, to the plates and drape them loosely around the edges of the salad. Garnish with the chives and the shiitake caps, if desired, and serve immediately.
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