Rice is offered boiled of fried mixed with vegetables or meat or omelet (scrambled eggs) and optionally cheese on the top.
They have 'dal bhat', that is boiled rice with lentil soup poured onto it. They eat it plain, with vegetables or with meat stew. 'Dal' means lentil and they use it even on the English menu, like 'dal soup'.
Potato: they offered it mainly fried, mixed with vegetables or meat or tuna (dunno how traditional this version is) and optionally cheese on the top.
They eat smashed potato as well, e.g. with cheese.
They have 'hash braun', that is mashed potato mixed with spices and fried.
They are proud of the quality and taste of the potato and it really tasted nice.
Potato can be grown even on the altitude of 4400m, in Dingboche.
Momo: this is a bit of something covered with thin pastry and steamed or fried. It resembles a bit to the Hungarian 'baratfule' or the Slovak 'pirohy'. The original one is stuffed with chicken. We ate them stuffed with mashed potato and cheese.
Update: I have just learned that mono is not traditional Nepali but it came from China. Though it became quite popular among Nepalian people.