I don't remember what this fruit is actually called, but the tour guide for Gran's Farm showed us tourists this fruit and shared with us the image of its insides on the cellphone. The brightness was turned up high on the right picture, so that you can all see it.

UPDATE: Looks like I got the name right after all from the same image on the right on the internet. Also, I found out that it is also called a "chico sapote." The title and tags are updated now.