Kale comes from the cabbage family and is usually found in two forms: kale, which has smooth leaves, and curly kale, which has crinkly leaves. Bizarrely during the middle ages was the most popular vegetable in England. Since then it's popularity has wained but now it is going through some what of a rival and is found on the plate of every gastro pub in London. It is really delicious but it does need a little bit of smartening up during the cooking process.
For a simple side of Kale here is the recipe:
Garlic / garlic puree
1. Break the leaves from the stalk, and trim away the tough centre stalk. Wash in cold water then dry.
2. Strain the Kale really well making sure to get rid of the excess water. Add some chopped garlic or garlic puree to the saucepan as well as a small knob of butter.
3. Return the kale to the saucepan and stir, cooking for another couple of minutes to cook out the garlic.