Yeah, they look like a yellow turnip, but I much prefer the flavour to that of turnips.
I grew up having them mostly in my mother's stew (which I disliked) but these days, I tend to have them roasted with other root vegetables and such in the oven, roast chicken optional.
They're a bit much to have a lot of on their own, in terms of flavour, but they're lovely with an assortment of other things.
Soup update, I just dug through my spice cupboard and added - chicken stock, powdered garlic, pepper, chili flakes, a garlic and chipotle spice blend, a bay leaf... And I think that's all? I was just chucking stuff in. Tastes pretty good already.