One of my favourite Mexican sweet treats is cajeta (pronounced ca-HAY-ta) --- carmelized sweetened condensed goat's milk. It can also be made with cow's milk. You might know it as dulce de leche. It's easy to make at home. Simply immerse an unopened can of sweetened condensed milk (like Eagle Brand) in a pot of water. Cover with 1" - 2" of water and bring to a boil. Turn it to low and simmer it for about an hour and a half. Top up with water if the top of the can is near exposure. Turn the can over and simmer for another hour or two. The longer, the darker the result. Let it cool. The substance carmelizes and makes a wonderful candy. At the bottom of the linked article are instructions for making it in the crock pot/slow cooker or pressure cooker.
It is sold in a jar but also in little patties called obleas - wafers.
Communion wafers. Who knew?