Instructions hot water chocolate cake

• Sift flour, dark cocoa powder, baking powder and baking soda into a bowl. Add salt, two types of sugar and instant coffee powder. The coffee powder is an optional ingredient that makes the chocolate flavor even more fragrant.
  
• Add egg, oil, milk and vanilla extract and mix briefly with a whisk just to combine the ingredients.
  
• At this point add boiling water and mix well with a whisk until the sugar dissolves completely and there are no visible lumps of flour. The batter will be quite liquid but do not add more flour.
  
• Line the bottom of the 18 cm round pan with a circle of parchment paper. Grease the rest of the pan with some butter and sprinkle with flour. If by chance you use the springform pan, I recommend taking a sheet of aluminum foil and covering the outide bottom edge of the pan. Seal the pan well as the batter is very liquid and may drip while baking.
• Bake the cake in a preheated static oven at 170 ° C for about 1 hour or until the toothpick inserted in the center of the cake comes out clean.
• Remove from the oven and wait 5 minutes. Flip the cake over the cooling rack to pop it out of the pan. Let it cool down completely before slicing or decorating.