Using a coffee grinder (or a mortar), grind the dried mushrooms into a powder and mix with the flour.
Wash the Portobello mushrooms and cut them in slices.
In a pan set on sharp fire, heat half of the butter and of the oil. Brown the Portobello mushrooms on both sides and deglaze with the Balsamic vinegar. Set aside.
Coat the milk-fed veal scallops with the flour mix and let brown in the other butter and oil half for about 2 minutes on each side.
Arrange the plate by alternating between the scallops and the Portobello mushrooms. Decorate with a branch of oregano before serving.
Suggested accompaniment: Provencal spinach and tomato couscous.