
1 tbsp olive oil
2 red onions, peeled, finely chopped
330g/11½oz plain flour
200g/7oz cold butter, cut into cubes
salt and freshly ground black pepper
2 free-range egg yolks
125g/4½oz pecorino cheese, finely grated
For the Greek salad, whisk the oil, lemon juice and zest, sugar and oregano together in a bowl until well combined. Stir in the feta cubes. Chill the mixture in the fridge overnight.
For the shortbread, preheat the oven to 180C/350F/Gas 4 and line a baking tray with greaseproof paper.
Heat the oil in a frying pan and fry the onions for 10-15 minutes, or until completely softened.
Meanwhile, blend the flour and butter together in a food processor until the mixture resembles breadcrumbs. Season, to taste, with salt and freshly ground black pepper. Add the egg yolks, cheese and cooked red onions and pulse the mixture to form a dough.
On a lightly floured surface, roll the dough out until 1cm/½in thick. Using a cookie cutter, cut out shapes or circles from the dough and place them onto the lined baking tray.
Bake in the oven for 8-10 minutes, or until golden-brown.
To serve, mix the watercress, olives and tomatoes together in a bowl. Divide the salad among 8 serving plates, top with a piece of shortbread and spoon some feta on top along with some dressing.
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