Heat a splash of olive oil in a medium pan

Chop the onion coarsely and add to the pan. Whilst the onions soften, chop the tomatoes into quarters, then add to the pan to soften

Slice the peppers and add to the pan

Add a sprinkling of oregano seasoning and a pinch of salt and pepper, and leave ingredients to simmer for a few minutes

Drain the tuna and add to pan

Throw in the olives and leave the ingredients to simmer again for 15-20 minutes

Line the tin base with the shortcrust pastry, and then pre cook on a high heat for 10 minutes

Once the filling is ready, add into the tin and then close the pie by adding the puff pastry on top

Cook in the oven at 200’ for 25 minutes, or until the pastry is golden brown