1)Always use full fat milk for making chenna.
2)Adding lemon juice to curdle the milk gives a nice flavour to the chenna.
3)You can reserve the whey water in a air tight bottle and when you make chenna for the next time, add this instead of lemon juice.
4) You have to wash the chenna really well to get the extra sour taste.
5) Hang the chenna to remove excess water, never place weight over it , it will make them tough.