Melt the syrup, sugar and fat in a saucepan over low heat. Let it cool down. Knead in egg, gingerbread spice, rum bake, flour and baking powder. Roll out dough thinly. Cut out about 30 rectangles (9x5 cm).
Put them on a baking tray lined with baking paper. Spread with condensed milk and decorate differently with nuts, kernels and cherries. Bake in the preheated oven (electric cooker: 200 °C/ gas: level 3) for about 10 minutes. Results in approx. 30 pieces