In a small bowl, pour in 2 tbsp of eggnog and sprinkle the gelatin over top. Stir to combine and let sit for at least 5 minutes.
Pour the eggnog/gelatin in a medium bowl and place a fine mesh sieve over the top.
Place the two egg yolks into a separate bowl and whisk until frothy.
In a medium sauce pot pour in the 150 ml of eggnog and the nutmeg, and heat over medium high, stirring frequently.
Continue heating until it just comes to a boil.
Remove the pot from the heat.
While constantly whisking the egg yolks, slowly stream in the hot eggnog.
Continue whisking for 30 seconds after all of the eggnog has been added.
Pour the eggnog/egg yolk mixture back into the pot and return to medium heat.
Stir constantly until it has thickened. It should coat the back of a wooden spoon.
Once thickened, pour it through the sieve into the bowl with the bloomed gelatin.
Whisk the custard and gelatin until smooth.
Lay a piece of plastic wrap onto the surface of the custard to keep it from forming a skin as it cools.
Set aside to cool at room temperature or place in the fridge after 20 minutes