It is very easy to make:
1) 2 liters of full milk (fuller is better)
2) several limes (the juice is needed, vinegar can also be used)
3) (optional) some pepper or freshly chopped coriander
Heat the milk until it boils. The adventurous can add a little crushed pepper or finely chopped fresh coriander to the milk when it starts to boil.
Add lime juice as soon as the milk starts to boil (turn off the heat and keep on stirring!). Add enough so that the milk curdles.
Press the remaining paneer under a heavy pan for a while to get rid of the remaining liquid. You should have a reasonably solid cheese left after about an hour, looking like this.
Cut into blocks and make palak paneer (photo).