
Rich, deeply savory, and made entirely from whole ingredients you can see and name, this slow cooker 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 additives like lecithin, carrageenan, or other emulsifying agents — this recipe sidesteps all of that by starting with roasted beef bones and nothing but vegetables, herbs, and water. Roasting the bones first at high heat builds a dark, complex base before the slow cooker even turns on, and the apple cider vinegar helps draw collagen and minerals out of the bones over the long, low cook. After 20 to 24 hours, what you get is a broth that gels firmly in the fridge — a sign of genuine gelatin content, not any additive doing the work. Straining through a fine-mesh sieve and skimming the solidified fat once chilled keeps the final result clean and pure. Use it as a sipping broth, a cooking liquid, or a base for soups and sauces where you want full control over every ingredient that goes in.
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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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