Meghan Markle has bottled it. Or more precisely, she has been making jam. Branded jars of her strawberry preserves, adorned with one of those frilly caps you see at village fete produce stalls, were distributed this week to assorted celebrity friends to post on social media (though possibly not for actually eating, given the restrictions of a Hollywood diet). This housewifely offering marks the debut of American Riviera Orchard, which sounds like one of Jamie Oliver’s children but is in fact the name of the Duchess of Sussex’s new commercial venture, under which she plans to flog everything from tableware...