You... you don't make enough money to afford that early on. I'm still in the tutorial with the training of the first female. The scribe job is my only available source of currency at around $3 a job for a total of $12 a day. By your calculations I would require 6 food a day to feed me, the slave, and the starter NPC that says she helps with training. That would cost more than I can make each day to afford the ingredients. Especially considering if I had the ingredients I couldn't afford to waste the time cooking them because I'd not make the money to buy more. On top of that, the very first 'quest' you have us get is one to purchase the most expensive food item. You probably should make a note in the quest to save this for later, as I killed my funds buying one piece because the hunger system is never even mentioned in the tutorial until you get a pop-up that people are starving. You DEFINITELY need to have a mention of the hunger system; preferably even before the purchase of the slave. It would have made me start with a cheaper slave to pool my starter funds better for food.
I'll check back on this game in a few months. Currently, I uninstalled it as it just seems like, in its current state, it will be a stressful nightmare of a highly unfair and unbalanced management game.