Grilled Tuna Kebabs with Wasabi Sauce

Name: Grilled Tuna Kebabs with Wasabi Sauce
Ingredients: 1 1/2 pound(s) sashimi grade tuna; 16 large shiitaki mushrooms; 2 large sweet red peppers; 1 large red onion; 8 - skewers if using bamboo soak in water; 1 1/2 cup(s) sherry soy marinade; 1 to 2 teaspoon(s) wasabi paste; ## SHERRY--SOY MARINADE; 1/2 cup(s) oil canols, vegetable or vpeanut; 1/2 cup(s) dry sherry; 1/4 cup(s) soy sauce, low-sodium; 2 tablespoon(s) sesame oil; 2 tablespoon(s) peeled chopped ginger root; 2 tablespoon(s) minced garlic; 1/4 cup(s) chopped cilantro; 3 - scallions sliced; 3 tablespoon(s) rice wine vinegar; 2 tablespoon(s) ground cumin; 1 tablespoon(s) achiote paste optional