Step 1

Preheat oven to 180°C (160°C fan/350°F).

Step 2

Mix the butter, sugar, flour and eggs in a stand mixer for 3-4 minutes until all is incorporated. If you don’t have a stand mixer, this can be done by hand or with an electric whisk.

Step 3

Split the batter equally into two bowls. In one of the bowls, add the cocoa powder and mix well.

Step 4

Grease the Bundt tin well with butter.

Step 5

Pour the plain batter into the Bundt tin and then add the chocolate batter on top. Using a blunt knife or teaspoon, swirl them together.

Step 6

Bake for 45-55 minutes uncovered. Check if the cake is ready by testing with a skewer; if the skewer comes out clean, the cake is ready.