Wash the lettuce thoroughly, clean and spin dry. Distribute on 4 plates.
Brush the mushrooms clean and cut into slices. Heat a little butter and fry the mushrooms in it for a few minutes, season with salt and pepper. Roast the pine nuts in a pan without fat.
Beat the oil with balsamic vinegar, season with salt and pepper.
Just before serving, add the mushrooms and pine nuts to the lamb`s lettuce and drizzle everything with the dressing.