We have 2 forms of help for this event:
Option 1) Step By Step Guide: Click here to follow a step by step guide for solving the puzzle. Contains spoilers.
Option 2) For a few hints, without spoilers, read below.
Igor has given you 2 of 3 Recipe Scraps for the Recipe, make sure you've seen it in the Brew Menu, it gives a lot of the information you need:
The ingredients for Igor's Mystery Recipe are hinted at in the Recipe Description. See if you can decipher them from there.
When you are guessing the Recipe, keep in mind that the position of the ingredients in the grid matter, so if you know which ingredients need to go into the recipe, but aren't sure where, try all of the possible combinations.
If you get stuck, have a look at the guide (contains spoilers).