Cut off the upper third of the lemons as a lid. Carefully squeeze the lid and lemons. Measure out 500 ml lemon juice. Put it into a pot with butter and 175 g sugar, boil down to about 300 ml, remove from heat and let it cool down. In the meantime, carefully scrape the remaining pulp out of the lemons and the lids with a teaspoon. Cut the bottom of the lemons straight
Separate eggs. Whip egg whites and cream separately until stiff. Whisk the egg yolks and 75 g sugar with a whisk of the hand mixer until white-creamy. Stir in lemon syrup, fold in cream and beaten egg whites
Spread the mixture into the hollowed lemons. Freeze the lid as well (put them next to each other!). Freeze both in the freezer for at least 3 hours. Remove the lemons and the lid, place the lid on the lemons, let them stand at room temperature for about 10 minutes, then serve
waiting time approx. 3 hours