Fruit and nut spiral cake (presnitz)

Instructions

1. To make the pastry, place 125 g (4½ oz) of flour in a mound on a work surface; add the salt and then make a well in the centre. Pour about 1 tablespoon of water into the well, working it into the flour using the tines of a fork. When you have worked it in, add a bit more water and work that in. Keep adding small amounts of water and working it in until the dough starts to come together. How much water you will need depends on the humidity in the air, so the amount will vary according to when and where you make the dough.  It should have the consistency of loose pasta dough. Form it into a ball, wrap it in plastic film and let it rest in the fridge for 30 minutes.
2. Place about 25 g (1 oz) of flour on your work surface (a cool surface such as stone or marble is best), then put the whole piece of butter on the flour. Working quickly so it doesn’t start to soften and melt, dust the butter in the flour and then roll it out with your rolling pin slightly, trying to incorporate some of the flour. Flip it over and repeat – you are trying to incorporate as much of the flour as possible. Roll the butter into a rectangle approximately 18 cm x 5 cm (7¼ in x 2 in). If the butter starts to melt or soften too much, wrap it in plastic film and put it in the fridge for 10 minutes before continuing. By now the dough should have rested for long enough.
3. Roll out the dough on your floured work surface to a 20 cm x 8 cm  (8 in x 3¼ in) rectangle. Place the block of butter on top, dust with a bit more flour and roll lengthways. Now fold it over like a letter by folding the top third into the middle and the bottom third over that. Rotate the pastry a quarter turn and repeat, rolling it into a longish rectangle, then folding it like a letter. Repeat once more, then wrap the pastry in plastic film and let it rest in the fridge for 30 minutes. 
4. Repeat the process of rolling, folding and turning the dough, then resting it in the fridge four more times, remembering to dust with extra flour if the pastry becomes sticky at any point.
5. To make the filling, when you have completed the first rolling, folding and resting of the dough (or about 2 hours ahead if you are using store-bought pastry). Place the drained sultanas, ground nuts, crushed biscuits, sugar, chocolate, honey, orange zest, salt and egg whites in a large bowl and mix well. You should have a thick but spreadable delicious-smelling filling. Cover the bowl and rest in the fridge for 2 hours. 
6. Preheat the oven to 180°C (350°F). Line a large baking tray with baking paper.
7. Roll out your pastry on a lightly floured surface until it measures about 50 cm x 25 cm (20 in x 10 in). Cut it in half lengthways so you have two long strips of pastry. Divide the filling in half. Place one long compact log of filling along the length of one pastry strip, leaving a gap of about 4 cm (1½ in) at each end. Carefully roll up the pastry to completely enclose the filling and fold down the two ends. Coil the log into a loose spiral and carefully lift it onto the prepared tray. Repeat with the remaining pastry strip and filling 
8. Whisk together the egg yolks and milk, then brush the egg wash generously over the two presnitz. Bake for 35–40 minutes until golden and the pastry is cooked through. 
9. Allow to cool completely, then cut into slices with a serrated knife to serve.