Chestnut and date stuffing

Ingredients

• 250g pitted dates, chopped
• 250ml freshly squeezed orange juice
• 40g butter, plus extra for greasing
• 3 celery stalks, finely chopped
• 1 large red onion, finely chopped
• 350g cooked chestnuts, chopped
• 1 Granny Smith apple, peeled and finely diced
• 350g fresh white breadcrumbs
• 1 tbsp dried sage
• 3 tbsp fresh parsley, finely chopped
• 1 large egg, beaten
• 100ml double cream