Cut the rye bread into small cubes, fry in 2 tablespoons of butter until golden, pour the boiling broth over it in a saucepan, let it boil completely, beat well with the hand blender and then pass through a sieve.
Sweat the flour with 2 tablespoons of butter in a saucepan, fill up with the bread infusion and cook well. Add curd. Sprinkle in the herbs before serving.