Method
-
1
Preheat the oven to 190°C/fan 170°C/gas mark 5. Put a baking sheet on a tray and place in the oven to get hot.
-
2
In a large bowl sift the flour. Using your cold fingertips, rub in the butter until the mixture resembles fine breadcrumbs. Into the mixture add all the egg and 2 tbsp water to mix to a firm dough, when mixed roll into a ball and wrap in clingfilm. Leave it to rest in the fridge for 30 minutes.
-
3
Lightly flour a large surface, roll out the pastry and use to line a 23cm tart tin, leaving any excess overhanging the edge. Line with baking parchment, fill with baking beans and bake blind in the oven for 15 minutes.
-
4
Remove the beans and parchment and bake for a further 5-10 minutes until golden. Leave to cool then and using a sharp knife trim the top of the pastry case.
-
5
In a large bowl tip the evaporated milk and sugar, using an electric hand mixer on full power, whisk together for 15 minutes until the mixture resembles a light coffee-coloured, creamy foam that doesn’t quite hold peaks.
-
6
Pour the mixture into the tart tin and bake for 20 minutes on the hot baking sheet. When cooked, the filling should be lightly set with a sticky surface. Leave to set overnight in the fridge.