More than likely, you haven’t heard of this. It was only available at Starbucks in Japan for one month in 2019. Here’s the proof!. I found it my first day of that trip and had at least one every day (I was there for 10 days). I tried the “white” once but then went back to the red. When I left Japan, I knew I would have to figure out how to make it at home. I tried and I was liking the results except I only had a Magic Bullet to work with and it would leave large chunks of ice. After getting a Vitamix and finally getting over my fear of it (the Vitamix), I had to look into this again. Check out this post where I experimented with variations for the base. This was my favorite from Allrecipes.com

Strawberry sauce
Ice
Whipped cream
Freeze dried strawberries, crushed (optional)

Make the strawberry sauce and allow to cool.
Blend strawberry sauce and ice until smooth.
Drop a dollup of whipped cream and strawberry sauce in a clear cup to decorate the sides.
Fill cup with strawberry mix from the blender
Top with more whipped cream and crushed freeze dried strawberries or just more strawberry sauce.