Peel and chop the onion, add to the meat, caramelise the onions, add the thyme and 5 minced garlic cloves. Peel and grate the carrots and add to the meat along with two cans of tomatoes. Add the tomato paste, and beef stock. Add one bay leaf, season with salt and pepper. Bring to a simmer, cover with an oven-proof lid and bake for 3 hours at 320°F – 160°C.