Get your 8 inch two piece tube pan ready, totally clean dry and grease proofed.

Separate Egg Yolks and Whites into two large mixing bowls.

Sieve together cake flour, cocoa powder, baking soda and salt a few times and set aside.

Melt 80 grams dark chocolate in 100 ml milk and set aside to cool. To this, add oil, instant coffee and vanilla extract, mix well and set aside.

Start whisking the yolks, after a minute, add 35 grams of granulated sugar gradually and continue beating for 8 minutes till the mix is pale white and is ribbony in consistency.

In another mixing bowl, start whisking egg whites, when it starts to foam, add cream of tartar, give a thorough mix, and then start adding the other part of 35 grams granulated sugar gradually. Beat on high speed till almost stiff peaks are formed. We do not want very stiff peaks, so be careful!

To the whipped egg yolks mix, add the flour mix alternating with oil & chocolate mix in three parts. Fold in with a spatula very gently, so that the mix is not deflated.

To this mix, very gently fold the egg whites with a rubber spatula, in three parts, till the mix is uniformly mixed, scoop out from the bottom, so that there are not flour mix lumps.

Pour the uniformly mixed final batter into the pan, level it, gently give a few taps and run a thin knife through the batter to break the air pockets.

Bake in the preheated oven for 60 to 70 minutes, until when you insert a wooden skewer into the center of the cake, it comes out clean.

Remove the cake from the oven and cool it upside down on the tube pan supports completely . After complete cooling, run a thin knife through the side , and push it out with the base from the tube. Now run the knife though the base and carefully remove the cake and place on the serving dish. You need a very sharp serrated knife to cleanly slice this cake.