Beef tallow is rendered or clarified animal fat — in this case, a cow, says Dr. Anna Chacon, a board-certified dermatologist in Miami, Florida. “Rendering animal fat makes it shelf stable and ...

by Tony Schwartz and Catherine McCarthy Steve Wanner is a highly respected 37-year-old partner at Ernst & Young, married with four young children. When we met him a year ago, he was working 12- to ...