In a bowl place sugar, eggs and whisk well until light and fluffy
In a medium pot place milk, vanilla and nutmeg and let it boil
Add 1/2 cup of the boiled milk mixture into the egg mix and whisk well. when fully incorporated, add in the rest of the milk and whisk well.
Pour the whole mixture into the prepared tray, cover with foil
Prepare the rice cooker or a steamer, with water on the bottom and place the tray on top and close the lid
Bake for 20-25 mins.if you wish to cook it in a different way, check the notes above
When it's cooked refrigerate for 4 hours or overnight in the fridge
To unmould, run a knife around the edges and unmould to a tray or dish