Love Salad

It is necessary:
 
one larger celery,
100 g button mushrooms,
little oil,
one carrot,
one potato,
one egg yolk
200 ml sour cream.

Preparation:
 
Grate the celery and mushrooms, cut into strips and saute.
Boil potatoes and cut into cubes.
All mixed with thin slices of carrots, season with salt and pour over sauce of egg yolks and sour cream.