I'll be honest: My immediate first thought was "Fake!", but I figured what the heck, I'll try to find it. I played around for a good bit, and this is the best I could come up with. I'm not sure how you got it to stick out so well (it's clearly a banana in your version), but props for finding it assuming its not fake.
Top left for reference, top right is a gradient channel map, bottom left is after some playing around with desaturation and adding back in some color, bottom right is inverted and messed with hue.