A traditional springtime recipe in Sweden, this soup makes use of the abundant young nettles shooting out at that time of the year. Nettle tops can be frozen for use later, though — and so can the soup itself. (At the time of publishing this post, nettles in the UK are flowering and seeding and it’s too late to harvest nettle tops, but it’s still possible to find some fresh shoots around the older ones).
To make it dairy-free, use 1T olive oil instead of the butter, and omit the crème fraîche. Leave out the egg as well for a vegan version.