Heat cream, espresso powder, salt and vanilla pod. Remove as soon as it simmers. Set aside to cool.
Whisk the egg yolks and 110g sugar
Temper eggs (add small amounts of warm cream to eggs, before combining all)
Strain custard, and divide between ramekins
Re-boil kettle
Carefully add boiling water around ramekins
Bake until the edges are set and centres are a little jiggly. The time depends on the depth of ramekins. Could be 20 ~ 45 mins. I ended up with ~25, which was good for really shallow ramekins
Remove pan from the oven and, remove the ramekins from the pan. Place on a wire rack to cool for at least 1 hour
Place in the refrigerator, loosely covered, and chill for at least 4 hours and up to 2 days before topping.