
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 a hard roast in the oven first, which builds a dark, caramelized depth that you simply cannot shortcut — and that flavor carries all the way through the long, slow simmer. Apple cider vinegar helps draw minerals and collagen from the bones over the 20-to-24-hour cook, while carrots, celery, onion, garlic, and fresh thyme round out the broth with a clean, aromatic backbone. Store-bought broths and stocks often rely on additives and stabilizers to achieve that silky texture, but here the gelatin comes entirely from the bones themselves — no thickeners, binders, or gums of any kind. When you pull it from the fridge and it has set into a firm, wobbly jelly, that's exactly what you want to see. Use it as a base for soups and stews, sip it warm from a mug, or freeze it in portions to have on hand whenever you need a clean, nourishing liquid that you know exactly what went into.
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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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