After a career in education, Lori Leinbach attended the Cambridge School of Culinary Arts in 1995 and decided to make a career shift. Eight years ago, she founded the Culinary Underground, a school operating out of her own Southborough kitchen, focusing on cooking skills. “It was just very basic cooking lessons — knife skills, how to boil an egg, that kind of thing,” says Leinbach. As classes grew, so did her kitchen, through two expansions, until she finally moved into a commercial space on Route 9 in Southborough. Today she’s teaching a wide range of students, including a growing population of children whose interest stems from cooking shows.