Whistling Kettle is my all-time favorite tea supplier. Unfortunately, this is the worst tasting drink I've ever made in my life. Unlike the pinned comment who INSISTS that matcha is just a processing technique, this is absolutely not true. Matcha is specifically shade-grown camellia sinensis leaves that are dried and powdered. Hojicha powder isn't called hojicha matcha, it's just hojicha powder. They say it clearly in the description: "100% pure butterfly pea flower is ground into a fine powder." THERE IS NO MATCHA IN THIS PRODUCT. Do not expect it to taste like, look like, feel like, or brew like matcha. It is NOT matcha. I knew this when buying it, but I wanted to make that clear because some of the reviewers here did not realize this.
As for the color, sure, it's gorgeous, but that doesn't make up for the fact that the actual flavor of butterfly pea flower is quite disgusting (through no fault of Whistling Kettle, obviously). Your best bet is to mix this into other things for the color, as thankfully the flavor isn't strong. I brewed this up using the ratio for matcha in tea ceremony (I'm a practitioner) and it was so awful my partner and I both had to spit it out and dump the rest down the drain. I experimented with adding milk or lemon, but it was pretty terrible. MAYBE in something like a banana smoothie I could see it working, simply to give color though.
The only thing I fault the company for here is daring to call all these powders 'matcha' when they have nothing to do with matcha. Powder + water does NOT. EQUAL. MATCHA. I'll say this as many times and as loudly as needed! Stop trying to make this a thing, it is clearly confusing to customers who expect green tea and are getting powdered flowers!