Season the chicken thighs and seal them off in a casserole dish, making sure the skin is golden brown. Transfer onto a warm plate then seal off the andouille sausage until browned a little, transfer onto the plate with the chicken. Add the onions, peppers, celery and garlic to the pan and sweat off until softened. Add the spices, sundried tomatoes and cook for a further 5 minutes.
Pour over the rice and mix thoroughly, making sure all the rice is coated in oil and juices. Add the stock, season and bring to the boil.
Cover and bake in a pre-heated oven at 170°C for 55 minutes. Remove from the oven, add the prawns, cover and return for 5 minutes.
Leave to rest for 10 minutes. Remove the lid and garnish with spring onions, parsley and tarragon.