Pre heat the oven to 180 ° C.
Dry ingredients : Mix flour, baking powder, baking soda with a whisk to ensure even mixing.
Wet ingredients : In another bowl, mix condensed milk, orange juice, oil, sugar, vanilla essence, lemon juice.
Add the dry ingredients to wet ingredients and mix well. Add orange zest (orange skin part, grated) and mix.
Transfer to a baking tray ( I used 8 inch square tin) greased with oil and dusted with flour.
Bake for 30 minutes or until a toothpick inserted comes out clean.
Cool down for 10 mins and invert over a wire rack to cool down completely. Trim the sides.
Prick the cake with tooth pick at various places.