>> it's actually a philadelphia cheesesteak that looks like a philly cigar. >> reporter: but in fact, his artistry, his fun, has a serious purpose. recently on the t.e.d. stage, cantu wowed the audience, asking them to bite into a raw lemon. they were stunned that it tasted like the sweetest, freshest lemonade. he did it by first having them put a little pill on their tongues made from a wild berry grown in west africa. it's nicknamed the miracle berry and looks like a long cranberry. inside, a mysterious protein that tricks the taste buds. so, if you wait a minute after you put it on your tongue -- >> just go ahead and lick that lemon. >> reporter: it's lemonade. no calories. no chemicals. and in a world facing an epidemic of diabetes, he wonders if this could replace the craving for something sweet. and in a world in need of food, what if starting with that berry