A tortilla or olives, anything small and dark that's edible
Boil your eggs!
I use bantam eggs, I always have issues with large eggs. I cook the small eggs in the water for about 10 minutes. I put in a little vinegar and salt while they boil, it makes peeling easier and the salt helps eggs with cracks not leak. When the eggs are fine boiling, I run them under cold water.
You will want to peel your eggs and cut them in half. Put the yolks in a separate bag. Once all the yolks are separate, add your mustard and mayo. This is totally personal preference! I put about 2 tablespoons each per 6 eggs or so. I also may sprinkle salt and pepper on it. When done, squish it all together!
Cut a small hole in the bag so you can squeeze the yolk mix into the whites. You can dye the yolks to make them more orange too. I even it so it looks like eyes and clean the white up some.
Put our tortilla or olive or whatever you choose for the pupil in the center. Get a toothpick, and with red food dye, trace veins in the white.
There you have it!