Help recreating Japanese Sweet Iced Green Tea from San Francisco Japanese Tea Garden

Spring break of 2025 I traveled from Florida to California to visit my best friend, and we visited the Japanese Tea Garden in San Francisco. There at the tea house I had the most amazing sweet iced green tea (on the right on the first slide) and have since been dying to have it again. The second slide has the website of the tea house's description of the drink, but I am still a tea beginner and have no idea how to recreate it based off that. Green tea sachets don't have the same saturated green color as the one I drank, and it tasted closer to a matcha. Others have suggested mixing matcha with sencha tea, which sounds interesting but I'm very much a beginner with making matcha. If anyone has made this before or has visited the Japanese Tea Garden and drank the same tea please any advice is welcome

by strawbsoup