
Rich, deeply savory, and made entirely from whole ingredients, this slow cooker bone broth is the kind of kitchen project that rewards patience in the most satisfying way. The bones get roasted at high heat first, which builds a dark, caramelized depth before they ever hit the slow cooker — that step alone makes a noticeable difference in the final flavor. A splash of apple cider vinegar helps draw minerals and collagen from the bones over the long cook, while carrots, celery, onion, garlic, and fresh thyme round everything out into something that smells absolutely incredible after 20-plus hours on low. Every single ingredient here is naturally free of wheat and gluten, so there's no label-reading stress or substitution gymnastics required. Store-bought broths and stocks can be surprisingly tricky — hidden additives, flavor enhancers, and shared production lines make them a gamble — but when you make it yourself, you know exactly what's in the pot. The finished broth should gel firmly once chilled, which is your sign that it's packed with collagen and genuinely nourishing. Use it as a base for soups, sip it warm from a mug, or freeze it in portions to have on hand whenever you need a clean, flavorful liquid that does real work in the kitchen.
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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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