Remove the dough from the fridge. On a lightly floured bench, roll it out to a 40x40cm (16x16 inch) square that's around 4mm thick. Use a pizza cutter or sharp knife to cut it into 16 equal squares, each approximately 10x10cm (4x4 inches).
Windmill shape: Make a diagonal slit from each corner of the square towards the centre, stopping around 1cm from the middle so the slits don't meet. Take one side of each of the four cut pieces and fold it into the centre, all folding in the same direction like a pinwheel. Press the centre gently to help it stick together. See the shapes section in the post for other options including the envelope fold and simple square.
Place the shaped pastries on baking-paper-lined trays, spaced well apart. Leave them to proof at room temperature (23-25°C/74-77°F) for 4-5 hours. They should look puffier and feel light. If they're drying out, drape a lightly damp cloth over them or brush gently with water. If your kitchen is cool, place them in a turned-off oven with a cup of hot water to create a little warmth. Just make sure the cup of water is to the side rather than directly underneath the pastries, as the heat rising from it can melt the butter layers.
Preheat the oven to 190°C/375°F. Mix together all the cream cheese filling ingredients (except the berries). Add a teaspoon of filling or pastry cream to the centre of each Danish, then top with berries or peach slices. 113 g cream cheese, 1 Tablespoon lemon juice, 1/2 Tablespoon lemon zest, 2 Tablespoons powdered sugar, blueberries
Mix the egg and water, then brush the exposed pastry edges with egg wash. 1 large egg, 1 Tablespoon water
Bake in two batches for 18-22 minutes until deeply golden brown. Keep an eye on the windmill points in the last few minutes; they can get a little dark. Cool on the tray for 30 minutes.
Dust with icing sugar or drizzle with an icing glaze. Serve warm.