The flavor of grass-fed beef is more distinct than that of grain-fed beef: Critics might call it "gamey, " though fans find it herbal and complex.

WSJ: Love and Barbecue

South American beef, which is grass-fed, is leaner and contains more omega-3 fatty acids than grain-fed American beef -- which explains, in part, how South Americans can eat such gargantuan quantities of it in one sitting, and then do it again the next day.

WSJ: Love and Barbecue