Can you guess the fruit?

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I'm not sure if all of you have seen or eaten this fruit but it's very common here in my country. Well, I understand for those who are not familiar with this as this may not available worldwide. At first, I was reluctant to pick this one because I never thought that it can be eaten. I almost let it be rotten or fall down from the tree thinking that I can do nothing with it. I'll will show you next time how the fruit looks like in its slice form.