Peel the onion and cut into wafer-thin slices. For the music mix 2-3 tablespoons of water with the vinegar, the oil, a little salt, pepper and sugar to form a marinade.
Place the Romadur on a deep plate, cover with the onion rings thickly and pour the marinade over them. Serve sprinkled with the chives. In addition, a strong farmer`s bread with butter.