Place the chicken pieces in a small bowl and add the oil, vinegar and 1 Tbsp of the Cajun seasoning and let marinate for 30 minutes.
Place the raw shrimp in another small bowl and add the other 1 Tbsp of Cajun seasoning. Let sit while the chicken marinates.
Cook the rice, as directed.
Once the chicken and shrimp have marinated, make the kebabs with chicken, shrimp, (andouille sausage slices, if using), bell peppers, onion and tomatoes.
Grill over direct heat for 5 to 7 minutes per side, or until shrimp are pink and cooked through and chicken is cooked through.
Serve Jambalaya Kebabs over rice.