Put 30 to 50 ml of milk in a heatproof container, and microwave for 30 seconds to 1 minute at 500 W. Put the matcha and sugar in the mug you'll be using.
Pour the hot milk into the mug little by little.
Use a small whisk or a spoon to mix well.
When the tea and sugar have melted, add the rest of the milk and microwave for about 1 minute.