Soak the peas overnight, then rinse and cook until pureed.
Boil the ham in salted water, remove and let cool. Add chopped potatoes and half a carrot to the broth. Finely chop the onion and remaining carrots, fry in vegetable oil until golden brown.
Cook the vegetables in the broth until half cooked for 20 minutes, then add the pea puree and fried onions. Add some salt. Separate the cooled ham from the bone, cut into slices and add to the soup. Bring to a boil.
Serve spilled onto plates with finely chopped herbs, croutons and sour cream.