A really easy family mid week meal that can be on the table in about 30 minutes. You can use any ratio of potato to parsnip or all potato or all parsnip for the topping. If you can't find kidney beans in chili sauce, just add 2 tsp of chili powder and 50g chopped roasted peppers instead. This isn't over spicy, making it fine for the younger members of the family. This can be made ahead of time and heated in the oven for about 30-40 minutes.