Here's a Lithuanian version, hope it helps.

Joe

YOUNG NETTLE SOUP

2 lbs. young nettles
2 lbs. beef with bones
1/2 lb. smoked ham
Soup greens, salt
1 tablespoon butter
1 small onion
2 tablespoons flour
1/2 cup sour cream

Make broth. Strain. Pick over nettles, wash and put into boiling salted water, let boil twice, strain and rinse with cold water. Pick over once again and chop finely.
Melt butter, add finely chopped onion and nettles, saute stirring frequently. Saute flour in butter until browned and add to nettle mixture. Add mixture to broth, bring to boil, stir in cream.
Cut up the ham, boiled in the broth, into small cubes and put into the soup tureen.
Serve nettle soup with croutons or potatoes.