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Unilever-owned Ben & Jerry's has launched a limited-edition raspberry sorbet ahead of summer in the US. Called Pucker Upper, the product features a tart lemonade swirl that has sour sugar bits – a new ingredient designed for the flavour. The sugar bits have a dairy coating, which prevents them from dissolving in the sorbet. Ben & Jerry's said that with half a gram of fat and 110 calories per serving, the frozen dessert “fills a niche in the sorbet category”.  "After 13 years with the company, I don't think I've ever seen a flavour quite like this," said Laura Essaid, Ben & Jerry's associate brand manager, who helped with the flavour creation process. "It's a perfect flavour for summer with a balance of sweet and sour, while light, fruity, and refreshing… plus, there's no grill required." Pucker Upper sorbet is available in pints with a suggested retail price of $4.89. Earlier this month, Ben & Jerry's formed a new dairy advisory council to provide guidance on sustainable agriculture and product manufacturing. The ice cream business has convened experts in areas such as environmental health, animal protection, water quality and organic farming. In January, the business expanded its lower-calorie Moo-phoria ice creams with the addition of two new flavours in the UK: salted caramel brownie and chocolate cookies with cream.