This is a main dish vegetable curry. Besides cauliflower it also has red potatoes and chickpeas. If you cannot find fire-roasted tomatoes, just use any diced tomatoes. Serve with na'an (an Indian flat-bread).
You can easily double this recipe and I suggest you do so, this chicken is fantastic! Plan ahead the chicken needs to marinate in the sour cream-Dijon mixture for a minimum of 5 hours. If you are using wooden skewers make certain to soak them in cold water for a minimum of 30 minutes before threading.