Bone broth is the year's hottest elixir. Rooted in centuries of global wellness traditions, stocks made from nutrient-rich bones have been shown to aid digestion and boost immunity. Chef Marco Canora of NYC's Hearth is leading the charge with Brodo, an extension where he sells cups of warm bone broth. Canora says he's confident he'll be able to release a chilled version for the summer months that's every bit as satisfying.