"The santol fruit is round and as big as a big apple. Inside the fruit there is a white juicy pulp around 3 to 5 brown seeds. The seeds are up to 2 cm long.
The pulp is mostly sub-acid or sour. When the fruit is not ripe, the fruit is very sour. The Filipinos like it in that (sour) condition and eat this fruit
with some salt. The fruit is usually consumed raw without peeling. In the local markets of the Philippines the santol is always for sale. Santols are
also used to make marmalade. In glass jars the marmalade is exported from the Philippines to oriental food dealers in Europe and the United States."
( ** text courtesy of the Hogeschool Utrecht (HU) website http://www.philippines.hvu.nl/fruit3.htm **)