1/2 cup butterfly pea flower, dried and blitzed into a powder
1/2 cup heavy cream
1/2 cup milk
3 egg yolks
1/3 cup sugar
Method
Simmer the cream, milk and butterfly pea powder and then let steep for 24 hours
Strain the mixture and add the salt then rewarm to just simmering
Whisk the yolks and sugar until pale and ribbony
Temper the eggs by adding a 1/4 cup of the warm dairy at a time whisking the whole time until the egg mixture is warm and not scrambled
Transfer the entire mixture back to the stovetop and cook over medium heat, stirring constantly, until the mixture reaches 170 F and coats the back of a spoon
Strain through a fine mesh sieve and cover with plastic wrap touching the surface of the custard to prevent a skin from forming