The actors and actresses perform everything in rythem from chopping veggies to mixing foods. Think of the show "Stomp" but it takes place in a kitchen and knives are flying all over the place!
A couple videos (not by us) give you a glimpse of the show. If you find yourself in Korea you should try to see it; it' a fun evening.
The knife skills of the actors on display (this is actually at some trade show or event and not in the actual theater):
Traditional Korean drumming mixed with modern performance by Nanta: