Pick a nice big turnip. NOTE: what Priors grew up calling "turnips" are apparently "rutabagas" to the outside world. Turnips are smaller, whiter and have lighter purple tops.* They are also unpleasant in my book. THIS is what I'm cooking.
Peel and dice your turnip. They're waxed for keeping, so make sure you really get all of the outside off. (Use a paring knife. A peeler won't work.) No one wants to eat a candle. Also, remember, the smaller the pieces, the more quickly they'll cook.
If you aren't going to boil them right away, you can keep them submerged in a bowl or pot of water with splash of lemon juice to keep them from discoloring.
Boil them until they're tender when poked with a fork or sharp knife. Drain and butter and salt to taste.
Mash and enjoy!
Don't listen to people who complain about turnips. More for us, I say!