Heat the grill. Thread chicken and spring onions pieces onto the skewers, alternately.
SAUCE: In a small pot combine the saki, mirin, garlic, ginger, chilli flakes, sugar and soy sauces. Simmer for 5-10 minutes, until sauce is reduced by about one quarter.
Grill the skewers for 2 minutes. Brush with sauce and turn, brush with sauce on the other side. Grill for 5-8 minutes more, brushing with sauce every 2 minutes, until the chicken is cooked through and glazed.
Serve yakitori with SIDS SALT & PEPPER to sprinkle on top.