Fans of the British monarchy are letting their feelings be known about Meghan Markle’s new brand of strawberry jam. The Duchess of Sussex sent out the first 50 jars of her jam to friends who posted pics of it across social media, but King Charles III’s personal farm shop at his Highgrove home reported increased sales of the King’s preserves at the same time. His Majesty has long sold a line of organic products from his Duchy Originals line, starting when he was Prince of Wales in the 1990s. In 2010, his company went into partnership with Waitrose, a line of British supermarkets that sell the p…