Step 1

Melt the butter with the water and caster sugar in a heavy-based pan.

Step 2

Bring to the boil, turn off the heat and immediately tip in all the flour.

Step 3

Beat thoroughly with a wooden spoon until the mixture forms a smooth ball in the centre of the pan.

Step 4

Turn the ball into a bowl and cool for 15min. Preheat the oven to 220°C (190°C fan) mark 7.

Step 5

Gradually whisk in the eggs a little at a time until the mixture is shiny.

Step 6

Sprinkle water over a non-stick baking sheet. Put eight large spoonfuls of the mixture on to the baking sheet.

Step 7

Bake for 30min until risen and golden brown. Turn off the oven.

Step 8

Pierce each bun. Leave in the oven for 10-15min. Cool on a wire rack.

Step 9

Halve buns and fill with cream. Top with warm melted chocolate.