
Rich, deeply savory, and made entirely from whole ingredients you can see and name, this slow cooker bone broth is the kind of kitchen project that rewards patience in the best possible way. Store-bought broths and stocks are notorious for sneaking in caramel color, annatto, or other synthetic dyes to achieve that golden, appetizing hue — but here, every drop of color comes naturally from roasting the bones until deeply browned and simmering them with carrots, onion, tomato paste, and fresh thyme for up to 24 hours. The apple cider vinegar works quietly in the background, helping draw collagen and minerals out of the bones so the finished broth gels firmly when chilled — a sign you've done everything right. Aromatics like smashed garlic, whole peppercorns, celery, and bay leaves build a complexity that no dye or additive could fake. Skimming the fat after chilling gives you a clean, clear result that looks gorgeous and tastes even better. Use it as a base for soups, sip it warm from a mug, or freeze it in portions for whenever you need a reliable, additive-free foundation in the kitchen.
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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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