Nettle!!! (yep, stinging nettle)
It's the first green in the spring and it contains a lot of vitamin C and iron too. For those with spring depression (there's another scientific term for this ) helps very much.

Ingredients:
young nettle leaves - 1 kg of leaves or more
few potatoes
2-3 onions
2 eggs
some oil
pepper
salt
red hot chili pepper
(you can add meat to this, but it's very good as a vegetarian dish)

Process:
clean and wash thouroughly the nettle leaves, boil them well. Cut the boiled leaves very small (I cut them in the blender). Don't throw the water away, keep it.
Cook the onion in the oil, add the leaves, add the spices and the potatoes in small cubes and some of the nettle water. Cook until the potatoes are very soft. Add the beaten eggs. It's ready!

With the remaining water you can wash your hair. Esp after the cold winter, the hair is a littlle fragile and deteriorated. It makes the hair softer. My father washes his hair with this for more than 15 years (with shampoo too of course) and still has the intact "chevelure" . Actually, the nettle is best for this after it had bloomed.