Pel'meni - aka filled gnocchi or tiny perogis.
They are putting out some really nice, handmade food for a great price, and they are a local staple in Madison (resurrected from years past).
We tried the mix of potato and meat which was good, but I might go meat only next time. For toppings, you can choose butter, sour cream, sriracha, curry, and cilantro (the works is all of the above). Personally, I liked the pel'mini in butter mixed with sour cream/sriracha.
I'd make this a favorite if they would offer some kind of sauces or more toppings, because there are limited combinations now.