Creating Kitchen Appliances: Spawn or Generate Food & Drinks

I have seen many talented modders create their own custom kitchen appliances that then spawn or generate custom food or drinks... How would one go about making something like that? I'm just curious, I'm no where near the level at scripting to even tackle something like this. Anyone has any experience doing something like this?

My thoughts are that you'd look at the basegame objects:
-coffee maker
-microwave
-fancy recycling trashbin with the animation

You'd look at custom appliances modders made:
-ravasheen's hot cocoa tray
-aroundthesims' toaster or yoghurt maker
-icemunmun's appliances

However, as a noob, I'm not even sure where to start. I just want a buffet table or to make a bgc version of the luxury party buffet table with the fondue/drinks fountain... but with custom foods that I downloaded or made myself. I want the options, you see.

I don't have the luxury party pack btw, so I'm stuck working with build-buy items from basegame, city living, dine out and get famous. I know city living has those festival tables that spawn food too, but I wouldn't know where to start making changes so that there's an interaction to change the food items it generates/spawns. I would definitely love to be able to click on the table and have it bring up the food menu list.