½ lemon, zest and juice
1–2 spring onions, white and green parts separated and finely sliced
100g/3½oz dried pasta shapes
salt and freshly ground black pepper
knob of butter or splash of olive oil
100ml/3½fl oz double cream
25g/1oz Parmesan, finely grated, plus extra to serve
1 thick-cut slice of ham, diced
100g/3½oz frozen peas