Tatties and neeps. MY version.
Scottish tatties and neeps is mashed-up potatoes and YELLOW turnips -- aka swedes, aka rutabagas. Then you add butter and nutmeg and ginger. However, mine was PURPLE-top turnips and cheese.
I took approximately the same volume of purple-top and potatoes, and a white onion, and boiled them all for, like, an hour. Then I threw them into the Kitchenaid with a half-stick of butter, and a bunch of cheese, and blended it up.
It is good.