For the spelt casserole, soak the spelt in water for about 10 hours.
Wash the vegetables, peel if necessary and dice. Then cook the vegetable cubes in a little soup on low heat until al dente.
Preheat the oven to 180 °C.
In the meantime, steam the spelt over moderate heat for about 1/2 hour, then leave to soak for about 1/2 hour.
Grease a large gratin dish. Mix spelt with vegetables and spread in the form. Mix egg yolks with sour cream and cheese, pour over spelt mixture and top with butter flakes.
Bake the casserole in the oven on the middle shelf for about 35 minutes.
Wash, dry and coarsely chop the herbs and sprinkle them on the baked spelt casserole before serving.