How to Make It
In a small saucepan, add soy sauce, mirin, rice wine, and sugar. Over low heat, stir until sugar dissolves. Increase heat, and simmer 6-7 minutes to thicken. Remove from heat. Set aside.
Cut the chicken into small, bite-size pieces, and place in a dish with 2/3 cup of sauce. Coat chicken, and set aside to marinate for at least 1 hour.
Preheat oven to 375°F. Thread marinated chicken and the scallions onto skewers. Arrange skewers on parchment paper–lined baking sheet. Bake for 8-10 minutes, until browned, sticky, and cooked through.
Meanwhile, use a spiralizer or vegetable peeler to transform cucumber into long, thin ribbons. Arrange on serving plates.
Place chicken on top of cucumber noodles. Garnish with sesame seeds.
Smart tip: Some stores now stock bottles of yakitori sauce. So if you're short of time, just replace this homemade sauce with 3 tbsp store-bought yakitori sauce instead (20 cals per tbsp.).