Golden Lava Salted Egg Yolk Buns

Steam 120 g duck egg yolks until firm, then mash into a paste.

Mix the mashed yolks with 50 g butter, 50 g evaporated milk, 10 g custard powder, and 60 g sugar until smooth.

Combine 250 g wheat flour, 3 g instant yeast, 5 g baking powder, and 30 g sugar in a bowl.