Wash and peel the asparagus and cut off the woody ends. Boil 1 1/2-2 litres of water with salt and sugar. Add the asparagus and cook for 15-20 minutes. Drain the asparagus and collect the asparagus water. For the sauce, heat 1/8 litre of asparagus water, stir in sauce powder and bring to the boil. Cut the fat into pieces and gradually stir into the sauce.
Grate cheese and stir into the sauce. Roll up a few stalks of asparagus in a slice of ham. Put the rolls in an ovenproof dish. Pour the sauce over it and bake in a preheated oven (electric cooker: 200 °C/ gas: level 3) for about 15 minutes. Wash the parsley, dab dry, chop and sprinkle over the casserole