By Laura Forsyth Matcha has been gaining popularity as a wellness trend lately, and you might be curious about the buzz surrounding this green powder. Derived from green tea, matcha boasts an abundance of antioxidants. Studies indicate it could offer advantages ranging from heart and cognitive health to managing weight. Popular coffee chain Blank Street aims to combat the 3pm slump before the Bank Holiday Weekend by urging the public to ‘Gather for Green’ in London this Friday (3 May). This Friday afternoon, Blank Street is offering a refreshing iced matcha latte ahead of the extended weekend….