Clean and wash broccoli and cut into florets. Cut the stems into slices. Clean and wash the spring onions and cut into rings. Heat the oil in a saucepan and sauté the vegetables in it. Add vegetable stock and cook over low heat for 10 minutes.
Puree the soup and stir in the creme fraiche (or sour cream or sour cream). Season to taste with salt and pepper. Melt the grated Emmentaler in the soup.