Thiru Kumar is a one-man wonder behind his Washington Square Park cart, which he's operated since 2001. There's always a line of people — which Kumar works through while fielding calls from regulars who make sure he's there, and chatting with favorite customers who gather on the other side of the cart. For the Vendys, he's making his signature dosas (pancakes filled with a spicy potato mixture), as well as a variety of Sri Lankan vegan dishes including samosas, veggie drumsticks and soups.