Mushroom Puff Pasties (A.K.A. Footballs) - cooking recipe

Ingredients

16 ounces frozen puff pastry (I use the Pepperidge Farm and I'm guessing at the size of One Box)
1 egg, beaten (I never use the egg)
For the filling
1 small onion, chopped
1 small carrot, grated
1 small potato, grated
3 tablespoons sunflower oil
1 cup mushroom, sliced
2 tablespoons soy sauce
1 tablespoon ketchup
dried thyme, generous pinch
salt & freshly ground black pepper

Preparation

Defrost the puff pastry for 20-30 minutes.
Gently fry the onion, carrot, and potato in the oil for about 5 minutes.
Add mushrooms, soy sauce, ketchup, thyme, and salt & pepper.
Cook, stirring occasionally, until the vegetables are soft and tender. Let cool.
Preheat oven to 400\u00b0F.
Cut each sheet of puff pastry into 4 squares.
Divide the filling among them, placing it to one side across the diagonal. Brush pastry edges with egg (I just use water) and fold over into triangles and press well to seal.
Put them on baking sheets (if you didn't make them directly on the baking sheets) and glaze with the beaten egg, if you like.
Bake for 15-20 minutes, until golden brown.