Yup, I was worried about this. The features were implemented in the last moment, so there were bound to be issues like these. So let me address them for future players.
To be fair I agree with you the menu looks unintuitive and clunky, I'm such a poor UI designer lol
And the spooky Yukari sprite was actually generated after I drew linework and let Clip Studio Paint auto paint for me lol, so if it's creepy, BLAME CLIP STUDIO PAINT :)
To serve, one should click the Text of the method they are going to serve, the Text can be found below the poorly drawn depictions, for example if the game asks for "Barbeque" one should click "Barbeque" under the Barbeque image to be sure, multiple clicks should be done. This is due to the stupid method i used to import sprites, causing overlapping hitboxes
Serve button will only work, if one selects a matching order, so if the game asks "Barbeque", player should click "Barbeque", then click the serve button or the next phase won't fire.
So the gameplay loop is basically, buy human, end turn, go to storage, select human, exit after a popup shows your selected human, operate on them and harvest all dem organs before serving them. Human will be deducted, buy new human. Repeat.