Slice the onion fine.

Cut the carrot and celery in small strips.

Pour olive oil in a frying pan and add the onion.

Bake for 3 minutes until the onion is translucent (but not brown).

Add the beef and bake until it's done.

Then add the carrot, celery and tomato paste and stir everything well.

Bake for another 2 minutes, while stirring.

Flavor the meat with soy sauce, water, salt and pepper.

Bring to the boil and let it simmer for 3 more minutes.

Turn of the heat.

Brush a casserole dish with butter.

Place the sheets of puff pastry on the bottom (about 5-6 sheets, the other sheets you will need for the topping.)

Put the meat in the puff pastry bowl.

Cover the meat with the remaining puff pastry.

Sprinkle the grated cheese on top.

Take the casserole to the oven en bake for 25 minutes.