Lemon, lime and passion fruit cheesecake tart

Method

1. Whizz the butter and sugar in a food processor until smooth. Add the flour and semolina, whizz to combine, then tip onto a work surface and bring together by hand into a dough. (If you don’t have a food processor, beat the butter and sugar in a large bowl with a wooden spoon until smooth. Add the flour and semolina and bring together with your hands to form a dough.)
2. Grate the dough into the tart tin, then quickly press evenly into the base and up the sides of the tin with your fingers to make a tart case. If it starts to feel greasy, chill it in the freezer for 5 minutes, then continue. Freeze for 1 hour.
3. Heat the oven to 180°C/160°C fan/gas 4. Line the chilled pastry case with foil and fill with baking beans. Bake for 25 minutes, then remove the foil and beans and bake for 3-4 minutes until the base has no grey patches and feels sandy. Set aside.
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4. Meanwhile, make the filling. Heat the caster sugar with the lemon and lime juice and zest (reserve the juice of ½ lemon) in a large pan over a medium heat until dissolved. Turn the heat to low and add the beaten eggs and yolks. Whisk with a balloon whisk until the mixture starts to thicken, then swap to a wooden spoon and stir for 10-12 minutes until thick and curd-like. Keep stirring to stop the mixture curdling. If it looks like it might curdle, remove from the heat, keep beating and return to the heat once it has cooled a little.
5. As soon as the filling has thickened, pour it through a sieve into a bowl and, using the wooden spoon, beat in the softened butter, bit by bit. Stir in the passion fruit pulp.
6. Soak the gelatine leaf in cold water for 5 minutes. Heat 3 tbsp of the filling in a small pan, remove from the heat, squeeze the water out of the gelatine leaf, then stir it into the hot filling until dissolved. Stir the mixture into the filling in the bowl.
7. In a separate bowl, mix the cream cheese with the icing sugar and the reserved lemon juice. Pour the filling into the pastry case, then dollop small blobs of the cream cheese mixture over the top. Use a skewer to swirl the mixture into pretty patterns. Leave the tart to set in the fridge for at least 3 hours before slicing.