Line and oil the cake tin.
Mix flour, cardamom powder, baking powder, and baking soda in a bowl.
Combine oil and castor sugar in a separate mixing bowl.
Add mango pulp to the oil-sugar mixture and whisk well.
Pour 1/8 cup of milk into the mixture and mix thoroughly.
Sift the flour mixture into the bowl.
Gently mix until no dry flour is visible.
Gradually add the remaining milk and fold into a smooth batter.
Transfer the batter into the prepared cake tin, tapping it to remove air bubbles.
Bake at 180°C for 30-35 minutes until a toothpick inserted in the center comes out clean.
Let the cake cool in the tin for 5-10 minutes.
Use a knife to loosen the edges, then invert to remove the cake from the tin.
Enjoy your soft and delicious mango cake!