Tayybeh, a Canadian pop-up and catering project powered by immigrants, sells out 150-seat meals in hours — What is Syrian food? It is muttabal shamandar, a velvety dip fragrant with beets, tahini, and olive oil; it is baba ghannouj, a chunky riot of eggplant and bell pepper; it is kebab hindi, tender meatballs swaddled in spicy tomato sauce. To Vancouverites, Syrian food is in part a way…