I love to grow turnips...both for eating and as a cover crop. Have many dozens growing right now in my garden.
IMO, turnips are best eaten raw...peeled and sliced with salt shaker in hand. Delicious.
The best cooking recipe I've had is really no recipe at all...just season to taste. Peel and slice a few depending on how many folks will be partaking. Bring to boil in a pot with butter, salt, pepper, and garlic . Then cover and let simmer for about 30 minutes. Semi-mash and serve with dollop of butter. Delicious...although may be viewed as an acquired taste by some.
One of the easiest garden veggies to grow, turnips are both nutritious and a powerful soil builder.
By the way check out the thread "nutgrass" to see my current turnips growing