In a large pot over low to medium heat, add whole milk and evaporated milk. Bring to a boil and add akasan (corn flour) and whisk until all combine and there are no lumps. Add remaining ingredients with the exception of the sugar and bring to a boil. Continue to stir or whisk mixture to avoid any lumps to form. Add sugar to sweeten to taste. If mixture is too thick to your liking, add regular milk. Serve hot.
Akasan will become thick when cold. It can be eaten as is or add milk and additional sugar to sweeten if necessary.