Ingredients

50g sugar
25ml water
3 egg yolks
1 stick (1/2 cup) butter
1 tsp vanilla / orange water / blossom water

Method

Mix sugar and water over medium-high heat
Whisk egg yolks in stand mixer
Slowly add sugar-water mixture
Mix
Add butter
Mix
Add flavouring

Derived from:

https://www.youtube.com/watch?v=DqUbPjHfJ0U