Trolled the internet for recipes and for the custard, it all seems the same, except for the buns. There were 2 recipes that caught my eye end decided to make both just to see what the difference was.
So here is my experiment and the results.
Ingredients80g salted egg yolk (6 yolks)
110g caster sugar (I used icing sugar)
55g custard powder
55g full cream milk powder (I used 50 gm coconut paste)