Bone broth is popular for its health properties, but I also like it for its rich, soothing, savory flavor–-and nearly zero calories.
Step: 1
Preheat oven to 400 degrees F (200 degrees C).
Step: 2
Arrange bones on 2 rimmed baking sheets and roast, turning occasionally, until well browned, about 45 minutes. Transfer bones to a 12-quart stockpot. Pour off fat from baking sheets, reserving 1 tablespoon. Add water and vinegar to pot and bring to a boil. Reduce heat and gently simmer, skimming off foam occasionally, 1 1/2 hours.
Step: 3
Meanwhile, arrange onions, carrots, celery, and garlic on baking sheet (from roasting bones) and drizzle with reserved fat. Roast vegetables, tossing occasionally, until softened, about 40 minutes.
Step: 4
Add vegetables to pot with bones, then stir in parsley, thyme, bay leaves, peppercorns, and mushrooms. Keep heat low enough that liquid barely simmers, and cook 12 hours (overnight).
Step: 5
Strain soup through a fine-mesh sieve and discard solids. Skim any remaining foam and taste broth. To intensify flavor, transfer soup to a clean pot and boil to desired concentration.
Per Serving: 48 calories; protein 2.4g; carbohydrates 10.2g; fat 0.4g; sodium 50.1mg.