
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. Store-bought broths and stocks are notorious for sneaking in synthetic preservatives like BHA and BHT to extend shelf life, which makes them a frustrating option for anyone trying to keep those additives out of their diet. Making it from scratch sidesteps all of that — every ingredient here is straightforward and clean, from the roasted beef bones to the fresh thyme and smashed garlic. Roasting the bones first at high heat is what gives this broth its deep, almost caramelized backbone, and the apple cider vinegar helps draw minerals and collagen out of the bones during the long, slow cook. After 20 to 24 hours on Low, you end up with a broth that gels firmly in the fridge — that wobble is a sign you've done everything right. It's endlessly useful as a base for soups, braises, or sauces, or genuinely satisfying sipped straight from a mug. Once you've made a batch this good, reaching for a carton at the store is going to feel like a real step down.
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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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