While Mulled Tea is probably good for WHM (I'd also say Buttons in a Blanket), for SCH I'd probably go for an egg dish like deviled eggs, due to the importance of crits for them. Bard is likely in the same boat, as well as any other job where crits do something special. As Determination is useful for all classes, it could be looked at as a "default" food stat to go for. The downside is, of course, with everyone flocking to it prices are going to be quite higher than other options. So, probably worth considering what OTHER stats you might need.