Ingredients

  • 6 tablespoon reduces-sodium soy sauce
  • 1/4 cup (packed) fresh cilantro leaves
  • 2 tablespoons mayonnaise
  • 1 tablespoon oriental sesame oil
  • 2 teaspoons rice vinegar
  • 1 1-inch piece peeled fresh ginger, chopped
  • 1/4 teaspoon cayenne pepper
  • 1 12- to 14-ounce fresh tuna steal (about 1 inch thick)
  • 2 bunches watercress, stems trimmed
  • 1 bunch radishes, trimmed, sliced
  • Sesame seeds

Method

  • Blend first 7 ingredients in processor until almost smooth.
  • Pour 1/3 cup sauce into glass pie plate; add fish and turn to coat.
  • Marinate fish 15 minutes per side.
  • Reserve remaining sauce.
  • Drain marinade from fish into heavy medium skillet.
  • Cook over high heat until beginning to boil.
  • Add fish and cook until just opaque in center, about 4 minutes per side.
  • Transfer fish to cutting board; cut crosswise into 1/4-inch-thick slices.
  • Combine watercress and radishes in large shallow bowl and toss to blend.
  • Arrange fish slices over.
  • Sprinkle with sesame seeds; serve with reserved sauce.