Spread the hot rice on a tray, drizzle in the rice vinegar and stir gently until cool.
Form the seasoned rice into eight balls.
Preheat the broiler (top heat of the oven) to 400F.
Wrap each rice ball with a bacon rasher.
Arrange the bacon wrapped rice balls in a tray lined with non-stick paper or a silicone mat, and broil for about 20 to 25 minutes until the edges of the bacon are lightly browned.
While the rice balls are in the oven, boil together all the ingredients for the teriyaki sauce until reduced in half.
Take the rice balls out of the oven and brush generously with teriyaki sauce. Do this three or more times to allow the bacon to absorb the sauce.
Put the rice balls back in the broiler and cook for another five minutes or so or until the teriyaki sauce caramelizes.
Optionally, sprinkle the teriyaki bacon rice balls with toasted sesame seeds before serving.