This can be refrigerated for upto 3-4 days .
To check whether the egg yolks are cooked enough , dip a metal spoon in it and run a finger along the back. You should have a clean line. Like in the tutorial pic.
This makes about 3 cups . Enough for 6-7 dessert servings.
Like all mousses , the consistency sets after chilling . So make it atleast a couple of hours ahead. You can have it immediately but it will be much softer.