Artichokes Cream Soup (Crema di Carciofi)

INGREDIENTS: (4 servings)
6 Artichokes
200 Gr. Potatoes
150 Centiliters Chicken Broth
65 Gr. Butter
1 Egg yolk
1 Onion
1 Celery stalk
Grated Parmesan cheese
Salt
Black Pepper

In a large pot, melt butter then add chopped celery onion and fry gently until golden brown
Add the most tender part of the artichokes and the potatoes cut into slices and cook for 5 minutes.
Wet with broth, add salt and pepper to taste, cook slowly for 40 minutes covered, and stir frequently
Remove pan from heat, add the egg yolk and the remaining butter.
Sprinkle with abundant grated Parmesan before serving