I just tried this recipe, and the result looks incredibly realistic :
You will need
250ml of water, 3 tablespoons of flour, 1 raw egg white.
1°/ Mix the flour into the water.
2°/ Bring to the boil,
stirring constantly until it tickens.
3°/ On a saucepan, mix with 1 raw egg white.
It's the easiest and most realistic recipe i ever found
