minutes. Check occasionally and add more water if necessary.
Cut the cherry tomatoes in half and add them to the pan with the stewed onions, together with the pitted olives.
Stir and continue cooking for a few minutes, until all the liquids have dried up. Remove the onions from the heat and let them cool.
Add the well-drained tuna, a handful of previously soaked and squeezed raisins, season with oregano and mix well.
Place the puff pastry rectangle with its baking paper on the baking tray and prick the pastry
