Heat the butter or margarine, sprinkle in the flour, sweat briefly and add the broth. Let cook for 7 minutes.
Whisk egg yolks and cream into the hot, but no longer boiling sauce. Then add chopped herbs and capers. Season to taste with lemon juice, salt, pepper and sugar.
Quarter eggs or very large eighths and let them warm up in the sauce.
Serve immediately, otherwise the ragout will get an ugly skin.
In addition: boiled potatoes and a small chicory salad.