At 36, Barry Maiden is chef and co-owner of Hungry Mother in Cambridge. But a little more than a decade ago, he was a nervous young cook heading to the prestigious restaurant L’Espalier for an internship. “The first night I walked in those doors, I was scared to death,” he said. “My girlfriend at the time, now my wife, and one of my friends bought me a cookbook that day to inspire me.” That cookbook was Julia Child’s 1961 classic, “Mastering the Art of French Cooking.” Maiden is just one of ...