Preheat the oven to 200°C (390°F). Roll out the puff pastry on a lightly floured surface and cut it into squares or rectangles.
Brush each piece with ketchup, then evenly layer the boiled sausage, smoked sausage, tomato slices, and pickled cucumbers.
Drizzle a little mayonnaise over the toppings and sprinkle with grated cheese.
Fold the pastry slightly over the toppings or leave it open like a mini pizza. Brush the edges with beaten egg for a golden, glossy finish.
Transfer to a lined baking sheet and bake for 15-20 minutes, until puffed up and golden brown.
Let cool slightly and serve warm. Enjoy as a delicious snack, appetizer, or quick meal!