Wash the chicory and remove the outer leaves. Halve the chicory, cut out the stalk and chop the leaves into small pieces. Peel and chop the shallots. Melt the fat in a saucepan. Add chicory and 1 teaspoon sugar and caramelise slightly. Add stock, season with salt, pepper, sugar and some lemon juice and let simmer for about 30 minutes
Clean and sort the mussels. Boil up white wine, add mussels and simmer covered for about 10 minutes. Lift out mussels, remove unopened mussels. Let the mussels cool down. Remove the mussel meat from the shells.
Wash the chervil, shake dry and finely chop the leaves of 4 stems. Pour cream into the soup, bring to the boil, puree finely and season to taste. Add chervil and arrange in bowls. Place the mussel meat in the middle and garnish with the remaining chervil