Just p[icked up the PDF for HQG (very impressive book -- I want the hardcover now) and while it's a simple overview there's a lot of fascinating stuff. It occurs to me that Gloranthan campaigns are all about flavor and the players and GM immersing themselves in societies and even ethical and thought patterns that are almost alien to the modern mind. As I was reading through the culot descriptions I started to wonder about food, oddly enough. And when I found that the equipment list did not contain any references as all to it other than the prices for "meat animals", I became even more curious.
If you were a guest at a clan feast or cult intitation ceremony, what food and drink would you be served?
What do travelers eat on the road, and does anyone make a living preparing food for them at resting places on their journeys?
What did you eat growing up, and what will you feed your children when you have them?
The answer depends on your culture, and since there are a multitude of cultures there will not be a single answer. One could ask when it will come up in a game, but it's the sort of nice, light touch that adds to the immersion of the setting.