If you go to Izakaya, you must be surprised, because you are often served one or two simple side dishes that you didn't order.
This side dishes are called "Otooshi", which are generally served right after you order. In direct way, the name "Otooshi" can be translated as "passing" in English, and which shows your orders are accepted.
Usually, Otooshi are what go well with the food subsequently served, like young soybeans in the pod or salted fish guts.
In Kanto area, we call it Otooshi, but here in Kansai, it is often called "Tsukidashi".