Cash only. Just make a note of that , since it's not very obvious. This is one of my go-to spots in Madison. Cheap and yummy -- they have two choices of tarkari that are described on cards on the tables. The cauli is my favorite: cauliflower, potatoes, peas, yummy. Go for broke and get dal and roti, all for under 10 bucks. It's a small place so not great for big groups, but conversely it's a great place if you are dining alone since you won't feel all weird. Service is restrained but attentive.