Slow Cooker Beef and Bone Marrow Pie

Ingredients

• 800g diced beef
• 100g high quality pancetta
• 1 tbsp butter
• 1 handful of fresh rosemary
• 1 handful of fresh thyme
• 1 handful of fresh parsley
• 3 tbsp tomato puree
• 150ml red wine
• 600ml rich beef stock
• 2-3 tbsp of flour or gravy thickener
• 1 sheet of ready roll shortcrust pastry
• 1 carrot finely diced
• 1 red onion finely diced
• 1 celery stick finely diced
• 1 egg to egg wash
• Salt
• pepper
• 1 piece of bone marrow for the middle of the pie