Not enough people cook mashed swede (aka neeps), which is a shame. Swedes have a unique flavour and, when matched with butter, nutmeg and lots and lots of black pepper, make a cracking partner for numerous meat and veg dishes. Haggis is, of course, the obvious thing to eat with neeps. But sausages with onion gravy, lamb stew and dumplings and even a smoked haddock gratin are well suited too.
If you anticipate being particularly busy just before dinner time, you could make this in advance and reheat it in a saucepan with a little water, or bake it in a low oven for 15 minutes with extra butter dotted on top.