3/4cupsuperfine caster sugar150 grams, or you may use granulated white sugar
1.5teaspoonvanilla extract7.5 ml
2tablespoonscocoa powder14 grams
Instructions
Pre-heat oven to 350 F degrees. Spray a 8 x 4 inch load pan with non-stick spray and set aside.
In a large bowl, sift together flour, cornstarch, baking powder, baking soda and salt. Set aside.
In a bowl or measuring jar, mix in 1.25 cups (10 oz) milk with 1 tablespoon + 1 teaspoon (20 ml) white vinegar. Stir and set aside for 5 to 10 minutes until it curdles a little.
Using the paddle attachment of your stand mixer or using your hand mixer, beat together oil and sugar until creamy and combined. Then add in the vanilla and mix.
Start adding the flour mix. Add 1/2 of it and mix. Then add the prepared milk+vinegar mixture (all of it). Stir in the remaining 1/2 of the flour mix. Remember to not overmix. The batter is now ready.
Divide the batter into 2 equal parts. I had 2 parts of 355 gram each. To one part, add 2 tablespoons of cocoa powder and mix.
Pour half of the vanilla batter in to the bottom of the prepared loaf pan. Spread with a spatula. Then pour whole of the chocolate batter on top. Spread with a spatula. Top with the remaining half of the vanilla batter.
Now, take a knife and insert it into the batter. Make a swirl going up and down once across the batter (see pictures in the recipe above).
Bake at 350 F degrees for 40 minutes or until toothpick inserted in the center comes out clean. Let the cake cool completely on a wire rack and then cut into slices. Enjoy marble cake with coffee!
Notes
To make the cake vegan, substitute milk with non-dairy milk like soy or almond milk. Follow the rest of the recipe as it is.