Preheat the oven to 160ºC (320ºF).
In a mixing bowl, whisk together the egg yolks and set aside.
In a saucepan, heat the heavy cream over medium heat until simmering.
Stir in salt, black pepper, and nutmeg.
Gradually add the cream mixture to the egg yolks, whisking continuously.
Strain the mixture to remove lumps, then mix in lemon zest (optional).
Divide crab meat and herbs among ramekins, then pour in the custard mixture.
Place ramekins in a baking dish and add hot water around them.
Bake for 35-40 minutes until set.
Cool at room temperature, then refrigerate for at least 3 hours or overnight.
Before serving, sprinkle sugar on top and caramelize with a torch.