200g/7oz long-stemmed broccoli, trimmed and each stalk cut into three pieces
1 small lemon, finely grated zest only
240g/8陆oz whole wheat penne pasta
salt and freshly ground black pepper
175g/7oz reduced-fat cr猫me fra卯che
25g/1oz Parmesan, finely grated, plus extra for serving
100g/3陆oz frozen peas