Seared Tuna with wasabi

2 (6 ounce) ahi tuna steaks , 6 oz each 1 teaspoon sesame oil salt pepper 2 (8 ounce) bags baby greens 1/4 English cucumber , thinly sliced 1 cup red pepper,[...]

1 teaspoon grated fresh ginger 1/4 cup low sodium soy sauce 3 tablespoons low sodium soy sauce (for dipping sauce) 1/8 teaspoon wasabi (more or less to taste)[...]

1/2 cup water 3 tablespoons wasabi powder (horseradish powder) 1/3 cup reduced sodium soy sauce 3 tablespoons peanut oil 1 tablespoon dry sherry 1 1/2[...]