AT A GLANCE
|01||Combine milk, yeast, sugar, ½ tsp salt and 60ml lukewarm water in the bowl of an electric mixer and stir to dissolve. Add flours and beat on high speed until dough is elastic and pulls away from sides of bowl (4-5 minutes). Cover and stand until dough doubles in size (45 minutes-1 hour).|
|02||Transfer dough to a lightly floured tray, cover and refrigerate until very cold (30-40 minutes).|
|03||Meanwhile, cut butter widthways into 18 slices, lay in a single layer on a tray and refrigerate until very cold (30-40 minutes).|
|04||Roll dough on a floured surface to a 23cm x 42cm rectangle and lay slices of butter, slightly overlapping, over centre third of pastry. Fold pastry bottom over butter, then fold over top pastry. Roll to a 20cm x 45cm rectangle, fold in thirds again, repeat rolling and folding twice more, wrap dough in plastic wrap, refrigerate until cold (30 minutes). Repeat rolling and folding twice more, wrap, refrigerate for another 30 minutes. By now you have rolled and folded the dough five times.|
|05||Preheat oven to 200C. Roll out pastry on a lightly floured surface to a 35cm square. Cut in half to form two rectangles, then cut each rectangle into thirds (you should have six rectangles about 11cm x 17cm). With shortest sides facing you, fold each rectangle into thirds, place on a baking paper-lined oven tray and brush with eggwash. Bake until risen and dark golden (25-30 minutes), then cool on a wire rack. Pastries will keep for up to two days stored in an airtight container.|
|06||To serve, preheat a grill to high (see note). Split pastries in half horizontally, place bases on an oven tray, layer with prosciutto, mozzarella and oregano, season to taste. Place tops of pastries cut-side up on tray and grill until cheese melts and tops are toasted (4-5 minutes). Sandwich pastries and serve immediately.|
Note You can also toast these pastries in a sandwich or panini press.