PS I don’t know about blooming or what that means.
I had to look it up :-) I have seen it done and recipes and I may have done it twice my whole life. It was just a little messy.
https://www.thekitchn.com/bloom-your-cocoa-powder-we-tried-it-240457
What It Means to Bloom Cocoa Powder
When cocoa powder is “bloomed” it’s mixed with a hot liquid, stirred well to break up any lumps, and then left to sit for a minute or two. The cocoa powder dissolves, which thickens the liquid and releases flavor particles within the powder. This technique brings out the best in cocoa powder and unleashes its ultra-chocolatey potential.
So, What Does This Mean for Your Desserts?
It means there are very, very good things ahead, fellow chocolate-lovers! Recipes for brownies, cakes, and beyond that call for cocoa powder to be bloomed, translate into bigger, more intense chocolate flavor in the finished baked good.