I've been making delicious ice tea with it for quite a long time - the process is fairly simple:

1. boil water, then allow to cool slightly, or heat up clean/bottled water to below the boil point. Don't mix matcha powder with just boiled water

2. put a couple tea spoons of good quality matcha in a cup or bowl, then add some of the hot water a little at a time, stirring into a loose paste with a smooth consistency

3. add the paste to a larger amount of hot water to create the concentrate, then dilute into a pitcher or serving glass