Place the diced apple, vegan butter, sugar and cinnamon in a saucepan. Stir on medium heat until butter and sugar melt, then continue to simmer on low-medium heat for about 3 minutes.
Sprinkle and stir in the cornstarch. Let thicken for about 1 minute, then take the saucepan off heat.
Let the apple filling cool down until it's not steaming anymore, which keeps the puff pastry from going too soft when the filling is placed on top.
Assemble and bake
Preheat the oven to 200℃ / 390℉ (fan).
Cut a sheet of puff pastry into six almost square shaped rectangles. We like to use a pizza cutter for this.
Place one of the puff pastry squares on a lightly dusted work surface or wooden board. Top it with a slightly heaped tablespoon of apple filling in one corner, leaving a ½ inch (1cm) border.
Fold the opposite corner over the filling, align the edges and then crimp them together with a fork to seal them tightly. If the fork sticks a bit to the puff pastry, dip it in some flour occasionally.
Place the sealed puff pastry turnovers on a lined baking sheet and repeat with the rest of the pieces until you have assembled all the turnovers.
On the baking tray, score the turnover tops with a sharp knife (we make three cuts), brush them with soy milk and sprinkle with sugar.
Bake the apple turnovers at 200℃ / 390℉ (fan) for 20 to 25 minutes, until golden brown. Let the turnovers cool down on a cooling rack.
Notes
ApplesWe recommend a firm apple for baking so that the filling still has some texture to it after cooking. Try apple varieties such as Granny Smith, Braeburn, Jonagold, Honeycrisp or Pink Lady. Adjust the sugar level to the sweetness of your apple.Puff pastryWe used a 35cm x 23cm (13" x 9") rectangular sheet of puff pastry weighing 320g. If the size or weight of your sheet differs from what we have specified in the recipe, you can adjust the serving amounts to calculate the amount of filling to suit you.Read our top tips in the post to help prevent leaking turnovers!