It is a vegetarian mix rice. There's many choice of food to pick and they are quite delicious. The thing I like from vegetarian food in Indonesia is the taste doesn't seems like a vegetarian. It's like normal dish, only without meat.
You can find Indonesian dishes such as rendang, sayur nangka, daun singkong, and spicy food.
Make sure you come in the morning, as usually they are sold out pretty fast. I once came at 1pm and they've closed :(
Almost forgot, the price is quite reasonable. Just like you eat a plate of normal mix rice :)
Do let me know if you're nearby the area, I might join you as well ^^