Cat-Su Sando is a delivery-only restaurant that specializes in katsu sandwiches. There are five different versions on the menu (like a fried pork cutlet and one made with smoked fish), along with kushiyaki, okonomiyaki, and onigiri. Along with their virtual operation based out of Humboldt park, they also do pop-ups at various spots around the city, like Pilot Brewing Project. Check their Instagram for details.