Knead a dough from the egg yolk, flour, sugar, butter, water and the lemon peel. Press half of it firmly into the springform pan lined with baking paper.
Bring 100 ml of cherry juice with the cornstarch and sugar to the boil and mix in 200 g of cherries.
Spread on the base, crumble the rest of the batter and sprinkle on the cherries.