Soak wooden skewers in water for a few hours prior, if using wooden skewers. *This is not a part of the recipe total time.*
Slide chicken, peppers, onion and pineapple onto the skewers, alternating as you go. Set aside.
For the homemade teriyaki sauce, measure all ingredients into a small pot. Whisk together and bring to a boil over medium heat. Reduce heat to simmer gently until sauce has thickened slightly. Remove from heat.
Place skewers onto hot grill and baste with sauce. Continue cooking and basting as you go until chicken is thoroughly cooked, about 3 to 4 minutes per side.
Serve skewers over brown rice.
**If you want to use the remaining teriyaki sauce over the cooked skewers, place pot back on the heat and bring back up to a bubble to kill any potential germs from basting raw chicken.