Wash and soak the jonna in water for a day. Then, shade dry the jowar. Grind it in a mixer to coarse grains. This is more like rava.
This can be stored and used when required.
Take the required amount of Rava and add 2 times its water and bring it to boil.
Curds or Milk can be added to this for drinking. Adding curds with salt makes this a great way to start the morning.