Wash the asparagus and cut off the ends. Roll out the aluminum foil (double) and place the asparagus on top.
Drizzle the asparagus with a little olive oil, season with salt and pepper and pour over the coarsely chopped garlic. Squeeze half a lemon and pour the juice onto the asparagus. Finally, put a few flakes of butter on top.
Fold the aluminum foil into a packet and close it tightly. Cook at 200 ° C (top / bottom heat) for 45 minutes.
Take the asparagus out of the oven and the packet (careful, steam) and serve. Salmon ham, hollandaise sauce and baguette are enough with the asparagus.