Bring the water to a boil in a medium thick-bottomed pot. At the same time, rinse the millet and drain.
Add the millet to the boiling water, immediately stirring from the bottom of the pot to prevent sticking. Reduce the heat so that the water is simmering. Partially cover the pot (so it doesn’t boil over). Cook for 15 minutes.
Shut off the heat, cover the pot, and let it rest on the stove to continue cooking in its residual heat for another 15-20 minutes before serving.
Notes
Freeze the leftovers in an airtight container for up to 3 months at best quality, or refrigerate in a covered container for up to 3 days. The leftover porridge will thicken in the fridge and almost appear solidified. Just add a splash of water when reheating to restore its consistency.