Cut the beef, pork, and lamb into large cubes. In a large bowl, combine the meats with the white wine, thyme, bay leaves, crushed garlic, salt, and pepper. Marinate in the refrigerator for at least 12 hours.
Peel the potatoes, carrots, and onions, then slice them thinly. Slice the leek into rings.
In a large Dutch oven or casserole dish, arrange a layer of potatoes on the bottom, followed by a layer of the marinated meats. Then, layer the carrots, onions, and leek. Continue layering until all the ingredients are used.
Pour the remaining marinade into the casserole dish, ensuring the ingredients are well-soaked. Cover the dish tightly with aluminum foil or a lid.
Bake in a preheated oven at 320°F (160°C) for 3 hours, or until the meat is tender and the vegetables are fully cooked.
Before serving, let the stew rest for 10 minutes to allow the flavors to meld. Serve with fresh bread or a salad.
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