PERETZ Gan inserts two blades of grass in a glass. After stirring it briefly, he says: "Here's your sweet tea; try it." Sweet? Gan did not use any sugar. Curious, TEMPO immediately sipped it. The aroma of grass immediately filled the nostrils. Wow, it really was sweet.

Apparently, it comes from the grass. Sweet leaves, as Gan calls them, are one of the dozens of plant varieties that he is developing, which he hopes one day will replace the rol