2½ tbsp olive oil
450g leeks, thickly sliced
350ml vegetable stock
100g self-raising flour
75ml fat-free natural yogurt
1 tsp thyme
leaves, plus extra to decorate
140g frozen peas
140g cooked ham, shredded
1 small apple, grated
Heat oven to 180ºC (fan). Heat ½ tbsp oil in a large pan, then fry the leeks, stirring for 5 mins until starting to soften. Add the stock, then simmer for 5 mins.
Meanwhile, tip the flour into a bowl, make a well in the centre, then add the yogurt, remaining oil, thyme leaves and a little salt. Using a cutlery knife, mix to bring together to a soft dough. Divide into 4 and shape into rounds on a floured surface.
Stir the peas, ham and grated apple into the leeks, then divide between 4 individual pie dishes or one large dish. Top each with a round of dough, scatter with more thyme, then bake for 20 mins until golden