The leaves of the peach tree, when very young, taste of Benzaldehyde. As they mature, they take on an unpleasant acrid pungency. It took me several growing seasons to figure this out. This year, I got it right.
The only reason that I know this is because I have a habit of tasting plants as they grow--not just the familiar parts-- all parts: flowers, leaves, roots, bark. I do this out of curiosity, not hunger, though it feeds my sense of discovery.
All plants are fair game--be they weeds, shrubs, flowers, or trees--if they are not harmful and taste good, then they have culinary potential. I rely on my knowledge of plants to steer me away from the toxic ones but I sometimes think that if I should die an untimely death, it could be attributed to having put something in my mouth that had no business being there in the first place. I could think of worse ways to go.
I also wanted to tell you about the fun I'm having making molds from silicone, but let me just say... get some. Trust me.