Cream the butter with the sugar until thick. Add the lemon zest and the eggs. Mix 3/4 of the flour and the cornstarch with the baking powder and the spices and sift over the meringue while stirring. Preheat the oven to 175 degrees.
If the dough becomes too firm, add a little milk by the spoonful. However, it should not become too thin, because half of the dough must knead through later. Thinly grease the bottom of a cake springform pan. Pour in half of the dough, smooth it out and bake in the heated oven for 25 minutes.
Peel the bananas, cut them into slices or mash them and add the juice of one lemon. Pour the banana mixture on the pre-baked base in the pan and sprinkle with the almond kernels.
Knead the remaining dough with the rest of the flour, roll it out to the size of the mold and place it on top as a pastry lid. Bake the cake at 180 to 200 degrees in 25 to 35 minutes.
Dust with powdered sugar while still hot and cool in the pan.
3rd World Shops in Lower Saxony, 2nd edition, Einbeck, no date.
Tip: Stock up on high-quality spices – it pays off!