I was watching one of those cooking shows the other day, and a contestant decided to whip up a batch of panna cotta, the wonderfully light and fruity Italian dessert. I asked Chef Jerry Pellegrino of Schola Cooking School, since it's such an easy dish, why don't more people try it? And I think it's because the key ingredient is gelatin, something modern home cooks don't work with very often. We offer some easy instructions