Nibblous | pancetta, parmesan and lemon stuffing rolls

Ingredients

• 50g butter
• 1 medium onion, finely chopped
• 1 celery stick, finely chopped
• 1 leek (about 200g), washed and thinly sliced
• Leaves from 2 fresh rosemary sprigs, finely chopped, plus extra small sprigs
• 175g fresh white breadcrumbs
• 75g finely grated Parmesan
• Finely grated zest of 1 small lemon
• 3 tbsp chopped fresh flatleaf parsley leaves (reserve the stalks for the turkey)
• 1 medium egg, beaten
• 16 thin slices smoked pancetta