Preheat oven (electric cooker: 200 °C/circulating air: 175 °C/gas: see manufacturer). Line a baking tray with baking paper. Roughly chop and mix the chocolate and cherries. Rinse orange hot, dab dry and finely grate the peel. With buttermilk and vanilla extract
Stir. Mix 200 g flour, starch, sugar, baking powder, baking soda and salt in a large bowl
Add cold butter to the flour mixture. Rub in coarse crumbs with your fingertips. Do this quickly! Stir in the buttermilk mix briefly. Then add the chocolate-cherry mixture
Stir only until a dough is just formed
Pour the dough onto a lightly floured work surface. The dough is relatively dry - this is correct. With a dough roller or your hands, roll out or beat out the dough to a thickness of approx. 1 1⁄2 cm. Use a heart cutter (approx. 9 cm Ø) to cut out hearts close together, jerking the cutter slightly back and forth. Place the hearts on the tray
Bake in a hot oven for about 15 minutes until the biscuits have slightly coloured. Take them out and let them cool down on a cake rack