TOP PHOTO: Lanzones or Lansones (as known in the Philippines). The yellow skin has a velvety feel.
To eat, you press the fruit (size of a very large grape) and peel off the yellow skin. Once you peel the fruit, it has 5 segments. The color is opaque white, smoother texture than a grape and has a distinct flavor of its own. It could be sweet or slightly sour depending on its ripeness. There is one large seed on almost every fruit which taste bitter and should be avoided. The fruit is seasonal.
Above, is Star Apple. Size of a baseball with skin about 1/5 inch thick. When cut in half, the fruit segments form like a star with black hard seeds inside. This fruit has a white flesh with some purple and green hue.
So if you visit Southeast Asia and you find this sold in the streets, you I recommend you try them.