Oat
Oats are also sometimes used in drinks. In Britain, it is used for making beer. Oatmeal stout is one of many beers using some oats.  A cold, sweet drink made of ground oats and milk is a well liked drink in  Latin America. 'Oatmeal caudle', made of ale and oatmeal with spices was a usual British drink and well-liked by Oliver Cromwell.