"That's a Rambutan."

"A close relative of the lychee, rambutans are native to Malaysia but found throughout all of Southeast Asia. When ripe they are deep crimson or bright yellow.  Sometimes used for desserts and preserves, they are most often eaten hand-to-mouth by cutting the rind in a circle and pulling half of it off. "

"Or just start peeling the rind away with your nail.  Once they get to know the fruit, lots of people pop the whole thing into their mouth and nibble down to the seed that is not, I repeat NOT, edible."