Finally I know how to make Lemon Chicken
Well its not that difficult!!
Marination: keep for 2-3 hours in the fridge…
boneless chicken diced to bite size
an egg white.
Rind of 2 lemons
4 lemon slices
butter [1/2 tbsp]
sliced green chilly 
cornflour [2 tbsp]
Once the marination is done, dust the chicken with some maida and deep fry and keep aside.
For the sauce, heat butter in a shallow pan. add a little oil to prevent butter from getting burnt. Add the chillies and let them release the flavor, do not burn them add the lemon rind, slices. Mix the cornflour in some water and remove all lunps. Gradually add the mixture to the pan and keep stirring. The sauce will have a lovely lime color Add a little salt. and add water to make the sauce as per your choice. Once it simmers for 2 min.
add the chicken and mix well [gently] Serve with noodles/rice.