Mung Beans and thermos.

In the olden days, my grand parents and my mum always boiled a big kettle of water first thing in the morning, and filled up their big thermal flask. We didn't have that piping cup of tea or coffee but there was always hot water.

Usually mung bean is boiled for a few hours to soften before it is eaten as a dessert.

For medicinal value, put a handful of mung beans inside the thermos and fill up with boiling water.  After a few hours, the water is good as a "cooling" drink in a hot day.