No, those aren’t tiny little watermelons. In fact, when I saw these at the Union Square Greenmarket a couple of weeks ago I had no idea what they were. “Mexican cucumbers,” I was told, and the vendor offered me one to taste. The thick skin pops under the teeth to reveal a seed-filled almost liquid interior; although the flavor and texture is reminiscent of a traditional cucumber, there is also a slight lemon flavor. I kept these in the refrigerator and snacked on them like peanuts, popping them whole into my mouth. I don’t know if there’s any way to cook with them, but there’s really no need when they’re so good raw.