The Classic Oatmeal Porridge Recipe always soaks the oatmeal overnight in either milk or water, it’s up to you. Soak in a covered saucepan and leave in a cool place. It’s worth making oatmeal porridge by the time-tested good old-fashioned method, and cooking it out very gently for a good half hour the next morning. Sweeten with dried fruits, sugar or honey.
It doesn’t matter what size of cup you use in this recipe, so long as you use the same cup for measuring everything.