In a mug, add the liquid ingredients like spiced plum relish, milk, oil, vinegar and whisk well with a fork. As the relish is thick and pulpy, you need the whisk to distribute it evenly.
In a small bowl, mix together the dry ingredients like flour, baking powder, baking soda, salt and castor sugar.
Add the dry ingredients mix to the mug and mix well with spoon till you do not see any dry ingredients.
Place the mug in a microwave and cook at high for 1 minute. I distributed the batter into 3 small tea cups and microwave-d all at the same time for 1 minute and they turned out well.
Take the mug out and let it cool completely and enjoy.
For the Brownie : Instead of castor sugar, use granulated sugar and do not add white vinegar in the liquid ingredients.
Microwave the brownie for 2 mins and give it a standing time of 1 more minute in the microwave, before taking out.
Let it cool completely. Enjoy as such or serve with a scoop of ice cream.
You can also use any fruit jam in the place of the plum relish. As the plum relish itself had spices in them, I did not add any flavoring agent separately but if you are going to use jam, use 1/2 tsp vanilla extract.