Clean the spinach very well.
In a pan with the olive oil fry a little bit the clove of garlic.
Add the spinach, pepper, and salt.
When cooked remove from heat and discharge the garlic.
Preheat oven at 200°C (400°F).
Add ricotta and grated Parmigiano Reggiano cheese.
Roll out with a rolling pin 2 thawed sheets of puff pastry.
Arrange on a baking sheet one sheet.
Add the spinach mixture and ricotta and level with a spatula.
Cover with the other sheet of dough puff sealing the edges of both with a fork.
Brush the surface and the edges with a salted, beaten egg.
Bake at 200°C (400°F) for 40 -50 minutes.
Serve warm or at room temperature.