In a large bowl, combine the beef, pork, and lamb. Add the sliced onions, crushed garlic, thyme, bay leaves, salt, pepper, and white wine. Marinate in the refrigerator for at least 12 hours.
Preheat oven to 350°F (180°C). Prepare a large oven-safe casserole dish or ceramic pot.
Place a layer of thinly sliced potatoes at the bottom of the dish, then layer the marinated meats and vegetables (carrots and leeks) on top. Repeat until all ingredients are used.
Pour the marinade over the ingredients, and cover tightly with a lid or aluminum foil.
Bake in the preheated oven for 2.5-3 hours, or until the meats are tender and the vegetables are soft.
Serve hot with fresh crusty bread.
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