Make a crème anglaise. Add gelatine and lychee liqueur. Pour into a springform pan (or Flexipan) and freeze.
Cream together butter and icing sugar. Add peanut butter, eggs, and then flour. Make sure not to overwork the pastry. Refrigerate.
Cream together butter and icing sugar. Add eggs, powdered almonds, ground peanuts and then flour. Set aside.
Mix together all ingredients. Using cling film, form pastry into a log and freeze. When ready to use, grate the pastry.
Place isomalt between two sheets of Silpat (non-stick baking liners). Bake at 180-200°C for 5-8 min. Remove top Silpat and top with coarsely chopped nuts.
Roll out the sweet pastry into bottom of springform pan. Apply the peanut almond cream using a piping bag. Top with pitted lychees*. Bake at 180°C for roughly 20 min. Three-quarters of the way through cooking, add the grated Streusel. Finish baking. Leave to cool on a rack. Before serving, top with lychee custard and decorate.
*250 g pitted lychees