Let Them Eat Turnips!

Yes, they taste of turnip.

They contain a lot of very healthy vitamins and minerals, especially potassium. They also contain phosphorus, folates, magnesium, calcium and vitamin C. Unlike other root vegetables the turnip tops (greens) are edible, as @NigelJ said)and have a lot of vit A and C. They recommended growing turnip tops during the war.

Another old traditional use for growing them is as a barrier to bindweed and horsetail. We tried it, successfully, when we moved here over 50 years ago. They were creeping through the hedge from the jungle garden next door and a local retired gardener, born in the late 1800's, told us about it. He got us a big bag of seeds from a nearby farmer and told us to sow them thickly (you don't get anything edible that way ). The first year they stopped them coming through and over the next two years there were none growing under the hedge. We've never had a problem with them since