Heat the milk up until boiling aggressively and then add lemon juice a little at a time until it splits.

Poor the whole mess through some cheese cloth or a fine sieve. shape the mass into whatever form you like (it's a little like nasty playdoe). Place it under a wieght of some kind over night to squeeze out all of the excess liquid.

Cut the paneer into pieces and add to curries or other dishes that you would like to have protein in.