place onions, garlic, tomato on base of tagine with a dash of oil and water
arrange meat in centre of the tagine, on top of the onions/tomato
sprinkle over your spices/seasoning
arrange vegetables around the meat in a kind of pyramid
more chopped tomato and fresh herbs on top
cover with the lid and cook over a low heat. Cooking time will depend on the protein used: Chicken, about 1 hour; lamb on the bone at least 3 hours
Check periodically that the tagine hasn't dried out, adding a little water as necessary
The vegetables will be soft – they are meant to be!