Creamy Celery Soup

Cut the celery into cubes of approximately 2 cm. Finely chop the onion, and cut the potatoes into 1 cm cubes.

Wash the lemon well and cut a few strips of zest (only the yellow part, without the white part which is bitter). Squeeze the juice from half a lemon.

In a pot, over medium heat, melt the butter. Add the celery and onion and sauté for 3-4 minutes, stirring frequently. Pour in 200 ml of cream, add the lemon zest, and bring to a boil.