Step one: Roast the bones first. Unless you’re using leftovers. Roasting at 400°F for 20 minutes changes everything. It adds depth. It makes your house smell like a cozy tavern. Do not skip this. Unroasted broth tastes like sad, watery regret.
Slow Cooker To Make Bone Broth at Nora Weeks blog
Step two: Dump bones in the slow cooker. Cover with cold water. Add a glug of apple cider vinegar. Throw in a carrot, an onion, and a stalk of celery if you’re feeling fancy. Salt is optional at this stage. Add it later, or you’ll risk a sodium bomb.
Step three: Cook for forever. I’m serious. Minimum 12 hours. Chicken needs 12-24 hours. Beef needs 24-48 hours. Your slow cooker will hum happily. Your electric bill will cry softly. But the rewards are worth it.
The Waiting Game
During hour six, you’ll wonder if you’ve made a mistake. Your house will smell amazing, but the liquid will look like dishwater. Patience, young grasshopper. By hour 12, it turns amber. By hour 24, it’s practically armor for your stomach.
Funny detail: I once left beef broth on for 36 hours. I forgot. It became a gelatinous brick in the fridge. I had to spoon it out like scrambled eggs. It tasted incredible. My husband refused to eat it because it “wiggled.” More for me.