Leek and mushroom flatbreads

• A couple of good knobs of butter
• 1 large leek, washed, halved and cut into rough 1cm dice
• 250 g

Preheat the oven to 220°C/gas mark 7.

Melt the butter in a heavy-based saucepan, add the leeks and mushrooms and gently cook for 3-4 minutes<