Is it possible for one race to value a particular type of item more than others? 'Cause I figure that those of a race with as much focus on wealth and agriculture simply wouldn't tolerate having to eat fresh greens, roots, and berries all the time if specialty breads, seasoned cheeses, and cured meats were available. So how about some intermediate-late game food preparation buildings for making more decadent ingredients to prepare meals with?
First of all, humans would need some method of procuring salt. I figure the easiest ways would be either grinding rocksalt at a mill or evaporating sea-water somehow.
Second, an extension of the vanilla butchery: the "Smokehouse". The most basic function of a smokehouse would be to take a bag of salt and a stack of meat and combine them into an empty bag and a higher value "cured meat" stack. Further functions would take this cured meat and a log to produce an even higher valued "smoked meat" stack and maybe some ash, there could be a different "flavor" of meat for every type of log burned in the reaction.
Third, an "Artisans' Cheesemaker" the whole concept would be taking a barrel of milk, an over-ground spicy plant of some sort, and a bag of "yeast" made by either grinding an underground plant or a boulder of cavefungus at the mill, and turning it into a few wheels of high valued artisan-cheese.
Fourth, a "Bakery" that would take flour, yeast, eggs, fuel, and milk to produce loaves of bread in bulk. In addition, the bakery could have additional recipes that require sugar and a berry plant to produce high value pastries.
Last, have the higher-tier foods give sort sort of temporary happiness buff when they're eaten. Like, maybe increase their resistance to tantruming/insanity or something, or maybe a small boost in speed to simulate how much healthier they are now that they're actually cooking their food instead of just eating it raw.