Ingredients:
- 3 pounds beef marrow bones
- 2 carrots, cut in 1 1/2-in. chunks
- 2 small onions, quartered
- 2 celery stalks, cut in 1 1/2-in. chunks
- 3 garlic cloves, unpeeled, smashed
- 10 parsley stems
- 6 thyme sprigs
- 1 bay leaf
- 2 teaspoons kosher salt
- 1 teaspoon black peppercorns
- 3 tablespoons apple cider vinegar
- 7 cups water