In a non-reactive mixing bowl, carefully combine the ingredients using a soft spatula for the filling.
We don’t want to whisk here, air bubbles are not a custard pie’s friend. If you’re extra picky, like me, I pull the chalazae off (the squiggly white part), so the custard is silky smooth.
Allow it to rest in the fridge for at least 1hr-overnight (best) so the acid and the egg will begin to set the custard up and thicken beautifully.