Amy Hamberry didn’t plan on becoming a snack-food magnate when she walked into New York Naturals, the Park Slope health-food shop, three years ago. She stopped in for a Cleansing Cocktail (carrot-apple-beet-and-ginger juice), and ended up marrying the owner, Joe Orr. And now Hamberry, a commercial illustrator and onetime kindergarten teacher, finds herself embroiled in a new profession: transforming kale, the entirely virtuous, dark-green-leafed vegetable, into an irresistible, only slightly less virtuous snack chip that’s poised to take over the health-food-store world. The journey began almost a year ago, when Hamberry and Orr decided to surmount supply and billing issues with their California kale-chip purveyor by making their own. This required the purchase of a dehydrator, Internet recipe research, and much experimentation. The result was Doritos for health nuts: raw, vegan, delectably crispy wafers, made from kale leaves laboriously massaged with a cheesy-tasting coating of pulverized cashews, cayenne, red peppers, and lemon juice, and air-dried at 115 degrees for up to fifteen hours.