I have identified few more parantha wala's and night time In & Out stores in South Delhi
Parantha wala at Yusuf Sarai remain's open all night (near to medical), there are 2 parantha wala's who serve all type of stuffed parantha's and tea all night
In & Out Store at Moolchand, GK 1 petrol station and Nehru Place also remains open all night, they serve everything starting from packed food to ciggs