Preheat oven to 200°C (390°F).
In a bowl, mix the ricotta with salt and pepper to taste.
Roll out the puff pastry and cut into 6 even squares or circles.
Place a spoonful of ricotta mixture in the center of each piece.
Fold the pastry into a half-moon (or diamond) shape and crimp the edges gently.
Optionally brush with egg yolk for a golden finish.
Place on a baking tray lined with parchment paper.
Bake for 20–25 minutes, or until golden brown and crisp.
Serve hot, preferably with a cup of tea or Maltese coffee.