To roast:
Add the carrots, onion, celery and chicken wings into an oven tray (I like to line it with baking paper to catch any bits and juices and make it easier to transfer to the slow cooker when cooked).
Sprinkle with oil and add sprigs of thyme, bay leaves and the garlic heads. Roast at 180C for 1.5 hours.
To slow cook:
Pour the roasted ingredients into the slow cooker and mash to release the flavours.
Add the stock, soy sauce and vermouth to the slow cooker.
Cook for at least 2 hours on HIGH or 4 hours on LOW (the longer the better!)
Strain and press through a sieve to get all of the good stuff out.
To finish:
In a small dish mix the cornflour paste into a 'slurry' - add a little gravy liquid at a time to the flour and mix well until smooth and no lumps.
Add the cornflour mix to the gravy and stir until it's combined. Cook on HIGH for about 15 minutes or until thickened.
Stir in cranberry sauce and check for seasoning.
Serve or allow to cool and store.
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