Spicy Tuna Burger

Name: Spicy Tuna Burger
Ingredients: 1 pound fresh, sushi-grade tuna steak; 1 scallion, finely chopped; 2 tablespoons cilantro, minced; 2 teaspoons ginger, minced; 1 Thai bird chile, minced; 1/2 avocado, mashed; 3/4 teaspoon kosher salt; 1/4 teaspoon freshly ground black pepper; 2 tablespoons extra-virgin olive oil; 4 sesame seed buns; 1 1/2 tablespoons wasabi paste; 1/2 cup mayonnaise; 3 limes, juiced (about 6 tablespoons); 1 tablespoon fish sauce; 1 tablespoon orange juice; 2 teaspoons rice vinegar; 1 clove garlic, minced; 1 1/4 cups romaine lettuce, shredded