Drinking matcha ice-cold is a revelation: there is nothing quite like it in terms of sheer refreshment, especially on a hot day. The rich matcha feels creamy, yet has a mere 4 calories per serving and about 25mg of caffeine, or about a quarter that of a cup of brewed coffee. And it couldn’t be easier to prepare: simply combine cold brew matcha with icy water – the icier, the better – in a water bottle, mason jar, or any clean bottle with a cap, and shake vigorously. We like to fill up a small pitcher with ice and filtered water, let that sit for a few minutes, and pour that very cold water (minus the ice) into our water bottle, add the matcha, and shake. We think it tastes naturally sweet on its own, but feel free to add your sweetener of choice if needed. The proportions are 8 ounces of very cold water to 1 gram (roughly half a teaspoon), and shake vigorously. To make 16 ounces of cold brew, use two grams (one teaspoon), and to make a quart, use 4g, or 2 teaspoons. It will keep in the refrigerator for some time, and can be re-shaken, but it tastes best brewed up to enjoy right away.