This is Pitaya fruit or a type of Dragon Fruit, the fruit emerges from a cactus-like plant and it tastes quite fresh... I have this plant next to the house. The taste of the fruit, there is a combination of sour and sweet sensations (sour is more dominant).

Meanwhile, the purple color really attracts attention. Honestly, I also want to take a bite of this pie if it's just a little sweeter.