Preparation
Slow Simmer
- The roast: Preheat oven to 400°F. Arrange 4-5 lbs mixed beef bones on a parchment-lined tray and roast for 45-60 minutes until they reach a deep mahogany brown.
- Transfer: Carefully scrape the bones and all the brown bits, the fond, from the pan into your slow cooker.
- Assemble: Add 1 large quartered onion, 2 large chopped carrots, 2 chopped celery stalks, 4 smashed garlic cloves, 1 tbsp apple cider vinegar, and 1 tsp whole black peppercorns.
- Water: Pour in 4-5 quarts cold filtered water until everything is submerged by at least an inch.
- The simmer: Cover and set the slow cooker to LOW. Let it simmer undisturbed for 24 hours, or at least 12-16.
- Cooling: Season the finished broth with up to 1 tsp sea salt, tasting as you add it. Strain the liquid through a fine-mesh sieve. Discard the solids safely.
- Rapid chill: Set your containers in an ice-water bath in the sink. Stir until the temperature drops to 70°F before sealing and refrigerating.