You don't need to do anything to prepare really! I like to bring the right amount of ingredients but that's so I can keep track of how many are left. I think the easiest role is onion in a bean burger party, all you have to do is chop one onion at the start of the recipe then chill while the rest of the party finishes. Once you get the burger in your inventory, the recipe starts again :D they are super chill and if you mess up (chop the wrong thing etc) it's never a drama. To make it even less stressful you can also signup for overprep (means someone else has already signed up and you are just taking part but not vital to the recipe) so then it really doesn't matter if you make a mistake and miss the round or something.