To make a vegan sushi roll you can use toasted nori sheets. They don’t need to be warmed up or anything, you just lay them on a cutting board to fill them up. Each nori sheet has only 10 calories so you can make two of them per person with a lot of filling.
When I first heard about Bustan (“garden” in Aramaic, Arabic, and Hebrew), I thought it was a new addition to Al Bustan, the Lebanese restaurant. No, I was told, it is not; and also, that they use a “tabun” oven (used in Middle Eastern baking).