Prepare the chocolate sorbet 12 hours in advance: Bring the water, milk, sugar, glucose and cocoa powder to the boil in a heavy-based saucepan, stirring continuously for 2 minutes. Reduce heat to a simmer. Add the chocolate and stir until melted. Remove from the heat and allow to cool. Pass through a fine chinois and churn in an ice-cream machine until it becomes smooth and creamy. Transfer to a container and freeze until ready to use.
Lemon tart filling: Wash the lemons, grate the zest, cut the grated lemons in half and squeeze out the juice. Pass the juice through a fine chinois and measure out
Sweet pastry: Sift the flour onto a work surface, make a well in the centre and place the softened butter into it. Sift the icing sugar onto the butter, add the salt and work it into the butter with your finger tips. Pour on the egg yolks and mix well. Gradually draw in the flour and mix to a smooth dough. Do not over-work the dough, as it will become elastic. Roll out the dough between 2 sheets of greaseproof paper to flatten; this makes it easier to roll out later. Refrigerate for 1 hour to rest before using.
Line the inside of the pastry ring with greaseproof paper and fill with baking beans. Blind-bake the case for 15 minutes, remove from the oven and allow to cool. Remove the beans and greaseproof paper and inspect the pastry for any holes or cracks. If there are any, fill with the leftover pastry to prevent the filling from pouring out during cooking. Brush the tart case with egg wash and return to the oven for a further 5 - 6 minutes until the pastry is lightly coloured. Remove the pastry case from the oven and brush with the egg wash once more but do not return it to the oven at this stage. Allow the pastry to cool. Reduce the oven temperature to 140°C.
Place the pastry case back in the oven and carefully pour in the lemon filling to the top of the pastry.
Remove the pastry ring and cut the tart into even sized slices. Generously dust each slice with icing sugar and glaze with a blowtorch until the sugar melts and begins to caramelise. Take care not to burn the sugar as it will become bitter. Dust the tart a second time and glaze for a crisp finish. Place a slice of tart on a plate with a chocolate tuille beside it. Set a scoop of chocolate sorbet onto the tuille.
© 2005 Liam Tomlin. All rights reserved.