When Liz Gutman and Jen King founded Brooklyn’s Liddabit Sweets in 2009, they momentarily considered not selling sea salt caramels. “We were like, eh, those have been done, people do them really well, we shouldn’t even bother to try that,” Gutman says. Good thing they did. The pair instantly sold out of the caramels their first week at the Brooklyn Flea Market and the sweets continue to be their bestseller “by far,” she says. Now, they’re teaching home cooks how to make the caramels and many other treats with “The Liddabit Sweets Candy Cookbook: How to Make Truly Scrumptious Candy in Your Own Kitchen.” We spoke with Gutman about the book and the business.