About 10 years ago I had a laproscopic gall bladder removal and second what people have said about light, easy to swallow, easy to digest for right after the surgery. What I have found long term is that fatty foods tend to make me ill. Things that most people don't find too greasy are too greasy for me. Everyone is different, but you might want to watch the fat content on whatever you make for your friend.
"I don't like to say that my kitchen is a religious place, but I would say that if I were a voodoo priestess, I would conduct my rituals there."-- Pearl Bailey