Line the bottom of a springform pan (26 cm Ø) with baking paper. Put biscuits in 1 freezer bag, close it and crumble finely with a dough roll. Chop the chocolate coating and melt in a hot water bath. Mix with the biscuits. Place the cake ring (26 cm Ø) on a cake plate greased with oil. Fill in the sponge mixture and press it on. Chill for about 30 minutes.
Soak gelatine in cold water. Bring lemon juice, 5 tbsp. water and sugar to the boil briefly (the sugar will then dissolve), cool slightly. Squeeze out the gelatine and dissolve in it. First stir in 2-3 tbsp yoghurt, then stir into the rest of the yoghurt. Keep cold until it begins to gel
Drain peaches well. Whip the cream until stiff. Fold into the yoghurt. Spread 6 tbsp. yoghurt cream on the chocolate base. Spread peach halves, except 1-2, on top with the curvature upwards. Spread the rest of the yoghurt cream on top. Chill for about 5 hours.
Cut the remaining peach halves into slices. Decorate cake with peach slices