Roast squash, sage, chestnut & pancetta risotto

INGREDIENTS

• 1 basic risotto recipe
• 1 butternut squash
• 1 level tablespoon coriander seeds
• 2 small dried chillies
• sea salt
• freshly ground black pepper
• olive oil
• 12 slices higher-welfare pancetta or dry-cured smoky bacon
• 100 g chestnuts, vac-packed is fine
• 1 bunch fresh sage, leaves picked
• 6 heaped tablespoons mascarpone cheese, optional