Put the rusks in a freezer bag and crush them with a cake roll. Melt butter and mix well with the rusk crumbs. Place on a fat pan of the oven (32 x 39 cm) and press well. Put in a cool place. In the meantime, stir cream cheese, sour cream, lime juice, coconut milk, sugar and vanilla sugar until the sugar has dissolved. Stir in eggs. Mix flour and starch, sieve over the mixture and stir in.
Pour everything on the rusk base and smooth it down. Bake in the preheated oven (electric cooker: 175 °C/ convection oven: not suitable/ gas: level 2) for 10 minutes. Reduce oven temperature (electric oven: 150 °C/ gas: level 1) and bake for approx. 40 minutes. Leave to stand for 10-15 minutes in a switched-off oven. Remove the cake and let it cool down on a cake rack. Wash and dry limes and cut them into thin slices. Cut the cake into 30 pieces and decorate with lime slices, coconut cubes and chips