With Princess Tabatha's invitation to the banquet, Elaina is now inclined to learn more recipes and cook more. Her cooking skills are adequate enough, but her knowledge of dish variety is pretty limited, and most of them are either common foods or beginner-friendly foods. They are good for the public, but if she also serves the royalty, she will have to get more food that is more adequate for the palate of the aristocrats and the royals.
Since her Almanac does not provide recipes, it's she either invents her own recipe or finds a recipe of her own. And her first choice for those recipes is to go to Douglas's pub, where he sells both recipes and cooked dishes.