
Rich, deeply savory, and made entirely from whole ingredients you can see and name, this slow cooker bone broth is the kind of kitchen project that rewards patience in the most satisfying way. The bones get roasted first at high heat until deeply browned, which builds a layer of flavor that no store-bought carton can replicate. Apple cider vinegar goes in early to help draw minerals and collagen out of the bones over the long, slow cook, while carrots, celery, onion, garlic, and fresh thyme round everything out into something genuinely complex. After 20 to 24 hours on low, you're left with a broth that gels firmly when chilled — a sign that it's loaded with natural gelatin and everything good. Tree nut allergies can make packaged broths and stocks a real gamble, since flavoring blends and shared facilities aren't always clearly disclosed on the label. Here, every single ingredient is straightforward and nut-free by nature, so there's no label-reading anxiety involved. Use it as a sipping broth, a base for soups and braises, or freeze it in portions to have on hand whenever you need it.
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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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