
Rich, deeply savory, and built for the long game, this slow cooker bone broth is the kind of kitchen project that rewards patience in the best possible way. Roasting the beef bones first at high heat coaxes out a deep, caramelized flavor before they ever hit the slow cooker — it's a step that makes a real difference in the final color and complexity. Apple cider vinegar goes in early to help draw minerals and collagen from the bones over the long cook, and after 20 to 24 hours on low, you're left with a broth that gels firmly when chilled — a sign you've done everything right. Aromatics like smashed garlic, fresh thyme, whole peppercorns, and a spoonful of tomato paste round out the flavor without any fuss. For anyone avoiding legumes, this recipe is naturally in the clear — every ingredient here is straightforward meat, vegetables, and pantry staples with nothing hidden to worry about. Skim the fat once it's chilled, and you've got a clean, nourishing broth ready to sip straight from a mug or use as a base for soups, braises, and sauces all week long.
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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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