The flavor of a particular santol (some are extremely sour, while others are sweet) depends on which part of the fruit is consumed. Sometimes the outer orange part of the fruit underneath the skin is eaten and in other cases it’s the inner white pulp. Typically the pulp is thought to be the sour part of the fruit. Today the santol is enjoyed in countries such as India, Indonesia, and the Philippines. - Delish.com
Yangmei - These small red fruits are native to China. Also called Chinese bayberries or Chinese strawberries, yangmei may look like berries, but they grow on trees. The small red circles that make up the outside of the fruit are eaten along with the inner flesh; just watch out for the small brown seed found in the center.
Langsat: These Southeast Asian fruits are berry-sized but require peeling before they can be eaten. Peel away the thick, yellowish-brown exterior to find the sweet, clear fruit. Langsats are often said to taste like a combination between a grape and a grapefruit, while the texture is more like that of a grape.
Rose Apple. Looks like a heart - you probably need some... Rose Apple (Chom Poo in Thai) – A crispy and crunchy refreshing taste. It is often eaten with salt and sugar. They kind of look like hearts so if you’re feeling unloved (or incapable of love), down a couple of these!