Start by finding a microwave-safe bowl.

Fill the bowl with water, rice, salt, and butter.

Place the bowl in the microwave. Cover it with an appropriate lid or microwave-safe film.

Cook the rice porridge at full power (about 800 W) for 5 minutes.

After five minutes, take the porridge out of the microwave and stir it thoroughly with a spoon.

Add milk to the porridge and place it back in the microwave.

Cook the rice porridge at full power again for five minutes.

After five minutes, the milk should have come to a boil. If it hasn't, cook it a bit longer. Stop the microwave when the milk starts boiling.

Remove the lid from the bowl.

Finish cooking the rice porridge at half power (about 400 W) for 20-22 minutes.

Serve the rice porridge with butter and cinnamon sugar.