Preheat the oven to 180C. Place the bones in a baking tray and drizzle with coconut oil
Bake the bones for about 40 minutes until browned
Add the bones to a slow cooker or a large pot with water (enough so the bones are just about covered)
Wash, peel and coarsely chop vegetables and addalong with all remaining ingredients
If using slow cooker, set to low/medium. If using large pot, bring to a simmer and then cook on low. For both methods, 8-12 hours is best
Allow to cool fully, strain and store liquid in glass jar in the fridge for up to 4 days (or freeze in reusable freezer bags/large silicone ice cube trays)