Finely chop the onion. Wash, quarter and seed the tomato. Finely dice the flesh. Wash lettuce thoroughly and drain well. Roast the hazelnut leaves in a pan without fat.
Remove the nuts and let them cool down. Wash medallions and pat them dry well. Heat the oil in a small coated pan. Fry the medallions for about 2 minutes on each side. Season with salt and pepper. Remove and keep warm if necessary. Fry the onion cubes in frying fat until golden brown. Deglaze with 2 tablespoons of water and vinegar, bring to the boil briefly and season with salt, pepper and mustard. Arrange lamb's lettuce and medallions on a plate. Add mustard marinade.
Remove and keep warm if necessary. Fry the onion cubes in frying fat until golden brown. Deglaze with 2 tablespoons of water and vinegar, bring to the boil briefly and season with salt, pepper and mustard. Arrange lamb's lettuce and medallions on a plate. Add mustard marinade. Sprinkle with tomato cubes and hazelnuts. Cut baguette into slices and serve with it
Vital-Tip: With lamb's lettuce healthy through the winter - it is just right, before the 1st wave of flu.