Grate parmesan. Form 4 Parmesan patties (approx. 16 cm Ø) on 2 baking trays lined with baking paper. Bake in the preheated oven (electric cooker: 200 °C/ convection oven. 175 °C/ gas: level 3) for about 10 minutes in succession until golden brown.
Take out, let cool briefly and turn over glasses. Leave to cool completely. Stir yoghurt and lemon juice until smooth. Season with salt, pepper and 1 pinch of sugar. Peel the lower third of the asparagus.
Cut off any woody ends. Cut asparagus diagonally into bite-sized pieces. Put butter and 1 pinch of sugar in enough boiling salted water and cook the asparagus for 5-6 minutes. Drain the asparagus.
Wash, dry and halve the tomatoes. Heat the oil in a pan and melt the tomatoes in it. Clean the rocket, wash and pat dry. Clean, wash and drain spring onions and cut into thin rings.
Mix the rocket, tomatoes, spring onions and asparagus. Put the lettuce in the parmesan baskets. Stick yoghurt sauce on top. Coarsely crush pink pepper and sprinkle on the sauce. Garnish with lemon slices.