Preheat the oven to 200°C (400°F).
In a bowl, mix the minced meat, chopped onion, salt, black pepper, and water until well combined.
Roll out the puff pastry and cut it into squares or rectangles.
Place a spoonful of the meat mixture onto each pastry piece and top with grated cheddar cheese.
Fold the pastry over the filling, sealing the edges by pressing with a fork.
Brush the tops with a beaten egg for a golden finish.
Bake for 20–25 minutes, or until the pastries are puffed and golden brown.
While baking, prepare the garlic yogurt sauce by mixing Greek yogurt, minced garlic, parsley, olive oil, and salt.
Serve the pastries warm with the garlic yogurt sauce for dipping. Enjoy!