Although its name (in Spanish) suggests that Pera-piña (pineapple and rice drink) is made from pears, in reality, it has been given this name because its taste and texture resemble that of pear juice. A favorite with kids, this nutritious drink is also the perfect merienda.
Combine pineapple rind and core with rice and 2 quarts [2 lt] of water in a large pot.Simmer covered over low heat until the rice is very tender and has tripled in size (about 20 minutes after it breaks the boil), adding water as it becomes necessary to maintain the same level. Remove from the heat.
Add vanilla extract, and let it cool to room temperature, blend until all the ingredients are liquified.Strain and discard the solids. Add sugar to taste.