Here is the recipe!
Started reading this with the "avacado, mashed," then followed the arrow to find him in the picture. And saw that the avacado is about to 'mash' the tomato. Then I thought it would be funny if they wre trying to do to each other what the recipe called for. So, for example, the tomato was trying to mash the avacado while he tried to chop the tomato.
I still think that would be funny, but as I thought about it more, I realized you'd end up with a lot of knives which sort of wrecks the whole spontaneous bar-fight scene.
Anyway, it's a fun shirt regardless ^_^