2: Prepare 500 g endives (head of chicory) and cut into pieces.
3: Peel and rinse 100 g potatoes, then slice but do not rinse again.
4: Melt 1 knob butter in 3 tablespoons olive oil in a large pan on medium heat, then add the onions and endives, salt and pepper. Cook without colouring, stirring frequently.
5: Add 750 ml vegetable stock and the potatoes. Bring to the boil.
6: Add the beer, cover and leave to cook for 20 minutes.