Cut the chicken into 1 inch or 2.5 cm cubes and place in a bowl.
Add red pesto marinade to the chicken pieces and mix well. Allow to sit for up to an hour or preferably overnight.
Soak 8 wooden skewers in water.
Pre-heat grill to highest setting at least 10 minute before you are ready to cook.
First thread chicken, followed by a piece of yellow pepper and onions through the skewers. Carry on alternating chicken, peppers and onion until you have four pieces of chicken. Repeat with 7 other skewers.
Grill for 15 to 20 minutes turning once at 8 minutes, until cooked. Cut open a piece to see if chicken is cooked.
Transfer to a serving plate