Place lamb shanks and onion wedges on a baking sheet lined with foil and parchment paper. Season with pepper, and brown them in the oven at 200C/400F.
When the shanks and onions are brown on one side (around 30 minutes), turn them and brown the other side for another 30 minutes or so.
Meanwhile, bring red wine, Better Than Bouillon, bay leaves and dried herbs to a boil in a pot.
Once shanks and onions are browned, add them to the vacuum pot. Add enough water to mostly cover the food.
Cover the pot and simmer for 2-3 hours, or until shanks are almost tender.
About 45 minutes before serving, wash and cut the cauliflower. Toss in the pan drippings and roast in the oven at 200C/400F for about 30 minutes.
Meanwhile, peel and cut the carrots into chunks and add to the simmering pot.
Once the shanks and carrots are tender, taste for seasoning and serve hot.