Rinse your mung beans well, and check over for any stones.
Place 1 cup mung beans and 3 cups water in a large pot.
Bring to a boil, then reduce heat and simmer until the beans are tender. This will take about 30 minutes.
Instant Pot instructions
Place 1 cup mung beans and 3 cups of water into the insert of an Instant Pot.
Seal the lid and ensure that it is set to "sealing".
Set to high pressure for 0 (zero) minutes.
Once the Instant Pot has reached pressure it will beep and start naturally releasing the pressure. Allow to natural release for 10 minutes, and then flip the valve to "venting" and release the remaining pressure.
Slow Cooker instructions
Place 1 cup of beans and 3 cups of water in the slow cooker.
Set to HIGH for 3 hours, or LOW for 6 hours. Check beans towards the end of the cooking time.
You can scale the quantity of beans up or down, but it should always be one part beans to three parts of water for cooking.
Drain any remaining water when the beans are cooked.
Cooked mung beans can be stored for up to 5 days in the fridge, or 3 months in the freezer.