One of my favorite food treats that we discovered in Old San Juan was what they called "La China Dulce."
Before we saw the stand selling the treats, we saw lots of people--old and young alike--with their faces buried deep in beautiful citrus fruits with white rinds, sucking up the sweet juice on the hot [winter] day.
When we approached the stand, we realized that the reason the fruit had white rinds was because it the outer orange rind was being removed, in a spiral fashion, to reveal the white pith below.
There was a man sitting before baskets and baskets of these fruits, passing each one through a hand-cranked machine that peeled the oranges (like one would peel an apple or potato).
Then, these partially peeled fruits were sold to passers-by for 50 cents a piece--either "open" with the top cut off, or closed, in a bag to go. You then just used your teeth to scrape out the sweet flesh and juice of the fruit as you strolled the beautiful pathways and plazas of Old San Juan, soaking up the majesty.