Ooooh! This is interesting! Very GOOD to know, bravo Flycam Developer & every screenarcher in the universe.
Well, Cullen preserving pickled dills... smoking hams... This is a very lovely idea. 
Still, I won't have thought of that myself. I'd think even if he grown up in a farm, he got sisters so it's entirely possible that the task of cooking will be delegated to his Mom & Sisters. Well I don't know much about how people live in a farm back then, the only sources I got is from Irene Hunt's Across Five April and those Little House on the Prairie (that everyone keep lending me lately for unknown reason...). In those books even young boys from large family (4 kids at least) are expected to work on the field since they can walk. The girls got task on the kitchen & the garden.
Still, the idea is endearing. I know of a guy IRL who really loves making jam & his own bread and I love him to death... 
Mmm, keep in mind that work divisions are very much a cultural thing and even in Anglo-European culture, the idea that women didn't do "heavy" work is a nineteenth century creation mostly of fiction (except for women from relatively well-to-do families) and had much more to do with creating a class division than anything else.
Though that's pretty irrelevant (and you don't want to get me started on one of my interests, lol) since the important point is that this is Thedas with a very different culture, including women in control of religion and as military officers, etc. Remember Horsemaster Dennet describes his wife as running the farms; he's mostly a horsebreeder and trainer. And his daughter appears to be following after him.
I would imagine Cullen having the kinds of books R2 mentions, heavy on Theodosian military history and strategies, but I'd include Genitivi's works, geographies, and possibly some works on the Dalish or non-humans. He seems like someone who'd be curious (and see himself as possibly having to deal with them in an official capacity).