Melt the butter at a mild heat. Fill the rusk into a freezer bag and seal it. Crumble finely with a rolling pin. Mix with the liquid butter. Place a cake ring or springform pan rim (26 cm Ø) on a cake plate lightly coated with oil. Pour in the rusk mixture as a cake base and press it down well. Chill for about 1 hour
Soak gelatine in cold water. Beat egg yolks and sugar for 3-5 minutes until creamy. Stir in yoghurt, lemon peel and lemon juice. Squeeze the gelatine and dissolve over a mild heat. Stir in 3 tbsp. yoghurt cream, then stir into the rest of the cream. Chill for about 10 minutes until it starts to gel
Beat 200 g cream until stiff and fold into the yoghurt cream. Spread on the cake base. Chill for about 5 hours.
Roast the grated coconut without fat, let it cool down. Whip 200 g cream until stiff. Spread on the cake. Sprinkle grated coconut on top. Just before serving, decorate with diagonally halved mini rusks and lemon peel