For the base, knead the ingredients for the dough and lay out the base of a greased baking pan and form an approx. 2 cm high rim.
Then roughly grate the rusks and set aside. Put the softened butter in a bowl and mix with the sugar, then add the eggs and stir everything until smooth. Finally stir in the coarsely grated rusks and spread the whole thing on the base. Bake at 200 degrees top / bottom heat for 25-30 minutes.