Mix the milk with the egg. Put the orange juice, cream and sugar in a pot.
Stir them on low heat (just enough to heat them, not boil) until everything becomes homogenized.
Once it cools a bit, pour it into glasses/bowls/cups and put them in the fridge to harden.
The 2 layers separate when they're put into cups and left to cool.
Note: The 2 layers need to be eaten together. The white part on its own isn't delicious.