The recipe used at Wizarding World of Harry Potter at Universal Orlando is:
Start to finish: 1 hour (10 minutes active)
1 cup light or dark brown sugar
2 tablespoons water
6 tablespoon butter
1/2 teaspoon salt
1/2 teaspoon cider vinegar
3/4 cup heavy cream, divided
1/2 teaspoon rum ...
There are no recipes for food that I know of from the kingkiller chronicles. However, there is a recipe for the alcoholic drink Metheglin if you're into brewing. The recipe can be found here in Pats blog. Be sure to check through the comments as some people there figured out some of Pats unknown ingredients.