Brew the espresso in your espresso machine or manual espresso maker. Regular or strong brewed coffee will not work for cappuccinos. For the best results, use espresso-roast coffee beans.
Set the espresso aside to cool off for a few minutes, so it doesn't melt the ice.
Prepare the steamed milk, using a milk frother, steam arm, French press, or mixer. Heat the milk before frothing it.
Fill a glass with ice, about halfway. Since the espresso is going to cool enough to not melt the ice, don’t overfill the glass.
Pour equal parts into the mason jar or glass with ice: espresso, steamed milk, and foam. Sweeten if desired and top it off with cocoa powder for a complete look.