Take the curds and hung over sieve for atleast couple of hours to get thick curds.
Grate the lemon for the zest and keep it aside, squeeze out the lemon juice.
Add the white vinegar to the milk and keep it aside until you get your mixing done.
In a bowl, sift the flour, baking soda, baking powder.
In a mixing bowl, beat the oil, sugar well.
Add the hung curds, lemon zest, vanilla essence and lemon juice.
When everything is well combined, add the flour mix in batches, alternating with the milk mix and fold it gently.
Grease and line a 9" x5" loaf tin and pour the batter into it.
Preheat the oven to 185C. Bake for 35-40 minutes.