1. Egg yolk mixed with sugar. Add milk and water until heated to 80 ℃.
2. Melted chocolate with hot water and added to the top, stirring evenly.
3. Creamy cream to 70%, then add the pistachio nut powder and mix well and refrigerate for 1 hours.
4. Wiped the mountain peak with a spatula and sprinkled with pistachio nuts.