DAILY DINNERS

Heat the oven to 210C/190C fan)/gas 6½ and line a baking sheet with greaseproof paper.

Finely slice the tomatoes with a sharp knife, so they are less than 5mm thick. Put them in a large colander, toss with a half-teaspoon of sea salt, and leave in the sink.

Roll the puff pastry into a roughly 32cm × 25cm rectangle and score a border 2cm from the edge. Transfer to the lined baking sheet and brush the border with the beaten egg. Lay three or four rows of the sliced tomatoes inside the pastry border, and nestle in the slices of onion as you go. Scatter over the capers (if using) and chopped olives, sprinkle over half the dried oregano and drizzle with two tablespoons of olive oil. Bake for 35–40 minutes, until the border is golden all over and nicely risen, then remove and leave to cool.

To make the topping, peel the cucumber into ribbons with a vegetable peeler and put in a bowl. Season generously, squeeze over the lemon juice, then sprinkle in the remaining half-teaspoon of dried oregano, crumble in the feta, add a tablespoon of olive oil and toss well. Scatter the cucumber mix over the top of the cooled tart just before serving.

Note: Bake the tart ahead of time, because it’s perfect served at room temperature. If taking it on a picnic, tub up the cucumber ribbons separately, then squeeze over the lemon and crumble in the feta just before serving.