Whisk the eggs in a large bowl, then beat in the flour, sugar, and milk until smooth.
Heat sunflower oil in a frying pan over medium heat.
Pour the batter in large spoonfuls into the pan, leaving room to expand.
Flip the pancakes when bubbles break on the surface and cook for two minutes.
Melt butter and optional icing sugar in a small saucepan over medium heat.
Add chopped apples and cook until tender and golden brown.
Pour in 71ml of advocaat and simmer until it reduces to a light coating.
Serve pancakes topped with apples and a drizzle of the remaining liqueur.