I learnt this recipe from a fellow forager when I randomly took a foraging tour in the heath (hampstead heath) one Saturday afternoon. I haven't tried it yet. BUt I did get stung by a nettle!
1 bag nettle (pick the nice fresh leaves at the top, and none of the flowery ones, pick the lighter green growing tips)
1 onion
Cook for 10 minutes.
Blend.
Olive oil and salt to serve.