
Rich, deeply savory, and made entirely from whole ingredients you can see and name, this slow cooker bone broth is the kind of thing that makes your kitchen smell incredible for an entire day. Carrageenan — a seaweed-derived thickener commonly added to store-bought broths and stocks — is nowhere near this pot, which is exactly the point. Many packaged broths and cartons sneak it in as a stabilizer, so making your own is genuinely the cleanest way to get a pure, additive-free result. The process starts with roasting the beef bones at high heat until they're deeply browned, which builds a layer of flavor that no shortcut can replicate. Apple cider vinegar goes in early to help draw minerals and collagen from the bones over the long, slow cook, while carrots, celery, onion, garlic, tomato paste, and fresh thyme round out the broth with natural sweetness and depth. After 20 to 24 hours on low, you'll strain it, chill it, and discover that a properly made broth gels firmly in the fridge — that wobble is pure collagen, not any additive. It's the kind of foundational recipe that quietly upgrades everything from soups and stews to sauces and grains.
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Heat the oven to 425°F (220°C). Arrange the bones in a single layer on a rimmed baking sheet and roast for 25–30 minutes, until deeply browned on the surface.
Transfer the roasted bones to a 6-quart or larger slow cooker. Add the carrots, celery, onion, garlic, tomato paste, bay leaves, peppercorns, thyme, salt, and apple cider vinegar.
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