Preheat the oven to 200°C. Saute the onion in only 50g of the butter/margarine for about 5 mins until it's softened. Add the rice, chilli, cloves and sultanas and stir. Add the water, bring to the boil. Reduce the heat, and simmer for about 15 mins until the water is absorbed. Add a little more water if necessary, but make sure it is all absorbed. Season with salt and pepper to taste.