The Vegetarian FSP Roll recipe is from Cape Cod restaurant owner and sushi chef Andrew Semler, who was actually trained in vegan cuisine. FSP stands for “fried sweet potato.” Finely julienned, golden crispy sweet potato is rolled with traditional sweet simmered shiitake mushrooms and blanched and grilled asparagus. If you want to enjoy even more crispiness from the sweet potato, make the roll medium-thick,