Preheat the oven to 220C/Gas 7. Place the cherry tomatoes in a roasting tin and sprinkle over the red onion, garlic and olive oil. Roast for 20 minutes until the tomatoes are softened.
STEP 2
Stir in the rice, chicken, chorizo, rosemary, chicken stock, saffron and some salt and pepper, mixing well together. Return to the over for a further 20 minutes.
STEP 3
Stir in the prawns and return to the oven for a further 10 minutes until the rice is tender and the chicken is cooked through.