Great Patty, simple, with good ingredients and an exceptional texture. Kids love it because it's filled with creamy mashed potatoes.
Also has green peas and a lot of tuna. The soft texture of the filling contrasts with that crunchy puff pastry that we like so much. My pie is round but it is also very nice if we use a couple of shaped puff pastry sheets rectangular.
Prepare the mashed potatoes as you like the most, even with Parmesan. The tuna used is canned, in oil. If your tuna is natural, do not forget to add a splash of extra virgin olive oil before putting the puff pastry on the surface.
More information - Mashed potatoes with Parmesan, Puff pastry pie with tuna