225g/8oz butternut squash, cut into 1cm/陆in cubes
1 medium onion, very finely sliced
2 tbsp fresh sage, sliced
1 tbsp light olive oil
Maldon sea salt and freshly ground white pepper
3 tbsp double cream
1 free-range egg
140g/5oz 骋谤耻测猫谤别, grated
2 x 375g/13oz sheets of ready-made short-crust pastry
125g/5oz Serrano ham, cubed