Stuffing Balls & The Best Gravy

Ingredients

• 2 tbsp unsalted butter
• 2 medium brown onions, very finely diced
• 2 cloves garlic, crushed
• 2 granny smith apples, peeled and diced
• 20 fresh sage leaves, finely sliced
• 600g sausage meat
• 120g fresh bread crumbs
• 100g cooked chestnuts
• 1 orange, zest only
• 1 tbsp sea salt
• 200g flour
• 4 eggs, beaten smooth
• 200g panko breadcrumbs
• 2 tbsp butter
• 2 tbsp plain flour
• 100ml white wine
• 500ml reduced stock (approx 1 litre stock to start)