Chicken Yakitori - Andrew Zimmern

Ingredients

• 1 1/2 cups water
• 1/4 cup kombu (1/2 ounce), broken into small pieces (see Note)
• 1/4 cup bonito flakes (see Note)
• 3 cups sake
• 1 cup soy sauce
• 3/4 cup mirin
• 1/2 cup light brown sugar
• 3 pounds skinless, boneless chicken thighs, cut into 1 1/2-inch pieces
• 2 bunches scallions (about 12), cut into 1-inch lengths
• 2 tablespoons sesame seeds
• One 4-inch piece of fresh ginger, peeled
• Vegetable oil, for brushing