Chef Simon Hopkinson says mayonnaise is a total pleasure to make, but people are often frightened to try to make it themselves. Monika Evstatieva /NPR hide caption

itoggle caption Monika Evstatieva /NPR

Global food giant Unilever, which owns the ubiquitous Hellmann's brand, is suing Hampton Creek, the maker of Just Mayo, an egg-free spread made from peas, sorghum and other plants. Richard Levine/Corbis; Courtesy of Hampton Creek hide caption

itoggle caption Richard Levine/Corbis; Courtesy of Hampton Creek