I will recommend PALAK LASUNNI and DAL MAKHANI.CHHOLA,KULCHA AND CHEESE NANA are other delicacies in authentic form.
Though the restaurant is simple and small it has really good food.and the prices are resonable.

They serve authentic Punjabi khana like home cooked without excess oil, butter or masalasAnd roti is the best PURE WHEAT ROTI FROM TANDOOR which you never get now.It reminded me of the Sanja Chulha of Delhi and Punjab.