Add ketchup, soy sauce, honey, mustard, lemon juice, brown sugar and garlic to a small pan and cook for 10 minutes. Remove from heat and allow to cool.

Cut chicken, peppers and onion into 1 1/2 in cubes.

Peel and core pineapple and cut into 1 1/2" cubes.

Place Pineapple, chicken and vegetables onto skewers alternating pieces.

Transfer 1/2 of sauce to another dish to use when serving.

Brush skewers with oil then with sauce and place on heated grill.

Baste skewers every 3-5 minutes while cooking. Cook for about 15 minutes.