First you have to give Zess T. the cook book. That means that she can cook 2 things together.Then cook a Point Swap + Mystery and you will get a random item it could also be a recipe wich will be recorded in your recipies file in your journal.But of course you know this but the random item can not be a badge.But one terrible thing is that the random item can also be a mistake. P.S. I got like 10 life shrooms doing this.