Bring the water, milk, salt, sugar and butter to the boil. Add the flour and dry out the paste. Using a mixer, gradually add the eggs. Using a piping bag, fitted with a 1 cm diameter pastry nozzle, pipe a crown shape of choux paste onto the puff pastry that has been pricked with a fork. Pipe a zigzag shape of choux paste in the middle. Pipe 1.5 cm diameter (4 g) choux balls onto a silicon mat. Sprinkle with icing sugar and bake in a fan-assisted oven at 180° C WITHOUT opening the oven door. Bake for approximately 20-25 minutes.
Make a caramel. Dip the choux balls in the caramel. Stick the choux balls onto the crown leaving one centimetre between each one.
Split and scrape the 2 vanilla beans into the Sublime Cream, add the sugar and whip. Pipe using a Saint-Honoré nozzle.