3/4 pound sashimi-grade Ahi tuna steak, cut into 1/2-inch cubes 1/4 cup green onion, thinly sliced 1/2 jalapeño chile, minced (optional) 1 tablespoon toasted sesame seeds 1 1/2 teaspoons lime juice 3 teaspoons sesame oil 1/4 cup low-sodium soy sauce 1 large avocado, peeled, pitted and diced Salt and freshly ground black pepper to taste Cilantro sprigs for garnish

3/4 pound sashimi-grade Ahi tuna steak, cut into 1/2-inch cubes 1/4 cup green onion, thinly sliced 1/2 jalapeño chile, minced (optional) 1 tablespoon toasted sesame seeds 1 1/2 teaspoons lime juice 3 teaspoons sesame oil 1/4 cup low-sodium soy sauce 1 large avocado, peeled, pitted and diced Salt and freshly ground black pepper to taste Cilantro sprigs for garnish