
Rich, deeply savory, and built for long, slow cooking, this bone broth is the kind of kitchen project that rewards patience with something genuinely special. The bones get roasted at high heat first, which builds a dark, caramelized foundation before a single drop of water is added — that step alone makes a noticeable difference in depth and color. Apple cider vinegar goes in early to help draw minerals from the bones over the long cook, while carrots, celery, onion, garlic, and fresh thyme round out the flavor without overwhelming it. For anyone avoiding cinnamon, store-bought broths and bouillon cubes can be surprisingly tricky — some blends sneak in warming spices you'd never expect in a savory product. Making it from scratch in the slow cooker puts you in complete control of every ingredient, and this recipe keeps things clean and straightforward. After 20 to 24 hours on low, you'll strain out a glossy, golden liquid that gels firmly in the fridge — a sign the collagen did exactly what it was supposed to do. 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 reliable, spice-free building block.
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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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