Beef Yakitori

Name: Beef Yakitori
Ingredients: 1/2 cup mirin (sweet rice wine) or dry sherry; 1/2 cup soy sauce, preferably reduced-sodium; 1/2 cup chicken broth; 1 tablespoon finely grated or minced fresh ginger; 1 teaspoon pressed or minced garlic; 3/4 pound sirloin or tri–tip steak; 8 green onions, trimmed to 4 inches from root end; 2 teaspoons toasted sesame seeds