Melt the syrup and fat in a saucepan over low heat. Let it cool down. Knead in eggs, gingerbread spice, rum bake, candy, flour and tartar powder. Roll out the dough about 2 mm thin. Cut out about 30 rectangles (9x5 cm).
Place on two baking trays lined with baking paper. Spread with condensed milk and decorate differently with nuts, seeds and cherries. Bake in the preheated oven (electric cooker: 200 °C/ gas: level 3) for about 10 minutes. Results in approx. 30 pieces