The Staten Island, New York eatery has a unique concept: With the idea that no one cooks a more heartful meal better than a grandmother, the restaurant is home to a rotating cast of grandmothers — or nonnas — who cook the meals they’ve been providing their families for generations. When it first opened, it only featured Italian nonnas. Now, the roster includes grandmothers from Sri Lanka, Azerbaijan, Trinidad, Syria, Japan and beyond. “We are not chefs. We are just grandmothers (who are) sharing our culture,” Maral Tseylikman said as she sat in the dining room.