1. Prepare materials.
2. Put the chocolate in a bowl, heat it over water and keep stirring until it is completely melted.
3. Add butter and continue to heat over water and stir.
4. Cool the completely melted chocolate and butter for later use.
5. Weigh the eggs, low-powder, sugar, and black coffee separately.
6. Boil the black coffee with boiling water.
7. Add fine sugar to the eggs and beat them until thick.
8. Sift low-gluten flour into the cold chocolate.
9. Add the rum and vanilla powder and stir gently with a rubber spatula.
10. Pour into the mold 7 minutes full.
11. Bake in a preheated 220 degree oven for 6-7 minutes. When it's not hot, tear off the paper mold, sprinkle with powdered sugar, and eat while hot.
Tips:1. This cake needs to be baked quickly at high temperature to have the effect of lava.
2. Adjust the temperature according to the power of your own oven.
3. Eat it while it is hot, the cake will lose its taste when it is cold.
