Preheat the Oven: Set your oven to 200°C (392°F) and line a baking sheet with parchment paper.
Prepare the Pastry: Roll out the puff pastry on a lightly floured surface and cut it into equal-sized squares or rectangles.
Add the Filling: Spread a small amount of ketchup on each piece of pastry. Evenly distribute the chopped boiled and smoked sausages, followed by the sliced pickled cucumbers.
Seal & Brush: Fold the pastry over the filling and press the edges together with a fork to seal. Brush the tops with the beaten egg for a golden finish.
Bake to Perfection: Place the puffs on the prepared baking sheet and bake for 15-20 minutes, or until they are puffed up and golden brown.
Serve & Enjoy: Let the puffs cool slightly before serving. They are best enjoyed warm but can also be stored and reheated later.