Dice the onion very finely. Mix vinegar, salt, pepper, mustard, a pinch of sugar, 4 tablespoons of water and both oils to make a vinaigrette. Add the onions.
Roast the pine nuts in a pan until golden brown. Peel the avocados and pears, cut in half, stone and cut into approx. 5 mm thick wedges.
Carefully mix the avocado and pear slices with the vinaigrette and arrange in a fan shape on a plate. Sprinkle with pine nuts and grate fresh parmesan on top.
Tip: so that the carpaccio does not turn brown, simply put a core of an avocado in the middle at the end.