Ingredients
Two 6-ounce boxes of gelatin mix, any flavor (peach or watermelon give the best color)
1 3/4 cups boiling water
3/4 cup cold water
9 ounces fat-free evaporated milk-don't use any kind but fat-free or it will curdle
Food coloring: about 15 drops each of red, green and blue will make a gray brain, but any colors will work
 
Directions
Before each use, wash the brain mold* with warm soapy water and a soft cloth or sponge.
Spray or smear the inside of the brain mold with a small amount of vegetable oil, then wipe out the excess.
Put the gelatin mix in a large bowl and add the boiling water.  Stir about 2 minutes until the mix is dissolved.
Stir in 1 cup of cold water.
Add the evaporated mild and food coloring and stir well.  Adjust the color if needed and stir again.
Pour the mixture into the brain mold, stopping about 1/4 inch from the top.
Place the brain mold in a shallow bowl so it will sit level, and refrigerate overnight or until firm.
To remove your brain, shake the mold until the gelatin loosens.  Place a flat plate upside down over the open side of the mold, then flip the mold and the plate together.  Lift the mold off, leaving the brain on the plate.

*You can Find Brain Molds on the web at Brain-mart.com or Archie McPhee Toys