Greek grain soup

Greek is famous for eating late dinner and party till morning. My Greek friend got home at 10pm and started cooking a simple dinner: grain soup with cheese. He added grains and cheese into water cooked with a slow heat. The soup looks like white milk and has a strong cheese taste. He finished a whole big bowl of it. I don’t think that is my type of food. Anyway, he has a very compact oven stove, which looks like a microwave.

Still do not know what is the name of the dish? Grain soup???