Associated Press food editor J.M. Hirsch shares some recent finds. “How to Eataly” by Oscar Farinetti is a guide to how to buy and cook Italian food, with a heft of respectable recipes tossed in. “Cooking with Gochujang” is by Naomi Imatome-Yun. Gochujang is an ingredient on the cusp of being discovered by the rest of America.