Mix the milk, the yolk, sugar and 5-spice herbs.
Tear the bread and croissant in small pieces and add to the milk mixture.
Leave to soak for a couple of hours.
Line the baking tin with foil and transfer the mixture into the tin.
Press firmly.
Carefully wrap the baking tin with plastic foil to make sure no moisture can get to it.
Cook the bread pudding in a combi steamer for 1.5 hours, at 85°C with 100% steam.
Let the bread pudding cool and store in the refrigerator. Cut into bars.
Sprinkle the bread pudding with a little sugar and brown just before serving.