Chop 75 g of chocolate and melt over a warm water bath. Wash lime, grate dry and grate peel. Use the rest of the lime for other purposes. Cream butter, 75 g sugar, salt and vanillin sugar with the whisk of the hand mixer.
Stir in the eggs one by one. Mix flour, 25 g starch and baking powder and stir in alternately with the milk.
Halve the dough, mix one half with liquid chocolate, the other half with lime zest. Pour the chocolate dough into a greased, floured box form (11 x 29 cm, 1.5 litres).
Spread light-coloured dough on top and swirl with a fork. Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: see manufacturer) for approx. 20 minutes. Take out and let cool down.
Pour the apricots into a sieve, drain well and cut into small pieces. Bring passion fruit juice to the boil with 25 g sugar. Mix 1 tbsp. starch with 3 tbsp. water until smooth, stir into the passion fruit juice. Let simmer for 1 minute, stir in apricot pieces and fill into a bowl, let cool.
Carefully turn the cake out of the mould, turn it over again and spread the still warm compote on the surface. Chill the cake for about 1 hour. Chop 75 g chocolate and melt over a warm water bath.
Mix cream cheese and icing sugar with the whisk of the hand mixer for about 5 minutes until creamy. Whip the cream until stiff. Stir the chocolate into the cream cheese, carefully fold in the cream. Spread the chocolate cream on the compote.
Dust with cocoa if necessary. Leave to cool for at least 1 hour.