This week, we investigate the world’s strangest food obsession: eating white dirt. We talk to Adam Forrester whose documentary “Eat White Dirt” will be released this fall. We’ll be tasting frozen yogurt, and we’ll speak with food writer Adam Gopnik about his philosophy on cherry pie. Then we’ll head into the test kitchen to learn how to make the best Strawberry Mousse with lots of berry flavor. And of course, we’ll be taking your calls to answer all of your cooking questions.