Preheat oven to 160C.
In a bowl, mix together maida, sugar, baking soda and cocoa powder.
Add oil, curd, milk, food colour, vinegar and vanilla.
Mix well to make a smooth batter.
Pour into a lined and greased 7" square cake tin and bake for 20 minutes.
Remove the tin, flip the cake onto wire rack and allow to cool completely.
Meanwhile, mix the vanilla cake batter.
Combine flour, baking powder and baking soda and set aside.
Add condensed milk, milk, oil, vinegar and vanilla in a bowl, mix well.
Add the dry ingredients and whisk all to combine.
Pour 1/3rd of the batter into a greased and lined 6" loaf tin.
Bake in the oven for ten minutes.
Final Assembly:
While it is baking, using a heart cookie cutter, cut out hearts from the red velvet cake sponge.
Arrange them broader side down in a neat line in the centre of the loaf tin and pour the remaining batter on top of the hearts.
bake it again for 30 minutes and check with a tester whether it is done.
Flip it onto wire rack and cool completely.
Slice it up and serve the sweet heart red velvet cake.