Pre-heat your oven to 350 degrees Fahrenheit.
In a medium sized bowl combine the cocoa powder, 1/2 cup (100 grams) of sugar and the hot water. Stir well to combine and set aside.
3/4 cup (90 grams) cocoa powder, 1/3 cup (80 mL) hot water
In another small bowl combine the flour, baking powder, vanilla powder and salt. Whisk until well combined.
3 cups (450 grams) all-purpose flour, 2 teaspoons baking powder, 1 teaspoon vanilla powder, 1/2 teaspoon salt
In the large bowl of a stand mixer, beat together the remaining sugar (2 cups or 400 grams) and the eggs until well combined. Slowly pour in the olive oil and continue to mix.
5 eggs, 1 cup (250 mL) olive oil
With the speed set to low, carefully add 1/2 of the flour mixture to the oil/egg/sugar combination in the stand mixer. Beat until well combined. Pour in 1/2 cup (125 ml) of milk. Continue beating and then add the remaining flour, followed by the remaining milk. Scrape down the sides of the bowl using a rubber spatula and then beat well for a minute until all of the ingredients are well combined.
1 cup (250 mL) milk
Remove approximately 3 cups of this cake batter and add it to the bowl which contains the cocoa powder, sugar and water. Using a whisk mix it well by hand so that all of the plain batter is combined with the cocoa batter.
Grease a bundt pan. Pour enough of the plain batter into the pan to cover the bottom surface. Then, using a large spoon, drop spoonfuls of the cocoa batter on top of the plain batter. Leave approximately 1/3 of the cocoa batter in the bowl.
Pour the remaining vanilla batter into the bundt pan, and then pour in the rest of the cocoa batter.
Bake in the middle rack of your oven for 50 – 60 minutes, or until a toothpick inserted into the center comes out clean.
Allow the cake to cool in the bundt pan for approximately 5 minutes before removing it. Set it to cool on a baking rack.
When your cake has completely cooled, dust it with icing sugar.
1/3 cup (45 grams) icing sugar,
Enjoy!