Heat the fat in a saucepan. Add flour and sweat in it while stirring, gradually deglaze with broth. Add cream, except for 2 tablespoons, and let everything boil a little over low heat. Meanwhile grate cheese finely. Wash the sage, dab dry well, pluck the leaves and puree them in the universal chopper.
Remove sauce from the stove. Add cheese slowly and let it melt while stirring. Whisk remaining cream with the egg yolk and add to the cheese sauce while stirring. Add sage to the sauce and season to taste with salt and pepper
Preparation time approx. 25 minutes E 9,02