This recipe is for store-bought flaky puff pastry filled with fried bacon pieces and onions, a mix of two cheeses, and topped with sea salt and caraway seeds.
Preheat the oven to 200°C (390°F) and line one large baking sheet with parchment paper.
Add the butter to a large frying pan set over medium-high heat, add the bacon, and fry it until slightly crispy. Remove the bacon and allow it to cool. In the same pan over medium heat add the thyme and onions and fry the onions until translucent and soft, set aside to cool.
To a large bowl, add the cooled crispy bacon, onion, mustard, and grated cheese and season to taste with salt and pepper. Stir until well mixed.
On a clean work surface or cutting board dusted lightly with cake flour, remove the puff pastry from its packaging and place the sheet of puff pastry on your work surface. Use a rolling pin to lightly roll out the pastry to ensure it is flat if needed.
Use a ruler and a sharp knife or pizza cutter to divide the puff pastry sheets into 8 equal squares of 10cm.
Spoon about a tablespoon and a half of filling into the centre of the square.
Lightly beat the egg in a small bowl and use a pastry brush to brush the edges of the pastry squares. Fold one corner of the pastry diagonally over to create a triangle. Ensuring that the filling stays in the middle.
Once you have lined up the edges of the triangle use a fork to crimp the two layers closed.
Use a pastry brush to brush the top of the pastry with the egg wash and then use a sharp knife to cut two small slits on the top of the triangle. Sprinkle with caraway seeds and flaked sea salt.
Bake the turnovers in a preheated oven for 40 minutes or until golden brown. Serve and enjoy!