Preheat oven to 400 degrees.
Leave puff pastry at room temperature for at least 20 minutes before baking.
In a pot, simmer leftover turkey, potato and onion with WATCHAREE’S Thai Massaman Curry Sauce for 10 minutes.
Mix corn starch with cold water.
Add to the curry one tablespoon at a time and stir until thickened.
Turn off the heat and add massaman curry filling and peanuts to a baking dish.
To make egg wash, beat one egg with water.
Cut the puff pastry to fit the baking dish and gently lay over the top.
Cut a slit in the pastry to let steam escape.
rush the top of the pastry with egg wash. Bake for 10-15 minutes until golden brown. Serve warm.