i have been to Park Balluchi in both their places..... and their food is just sumptuous!!!
The ambience is also too good... Try everything on their menu but make it a point to have their special 'Dahi ke kebab'... they are just awesome!!!
Brilliant food - ideal for office-parties on weekdays and bringing you family on dinners/weekends! Both the places are awesome (though the Hauz Khas one is a l'il difficult to find)
Don't miss out the "Pan Kulfi" right outside the restaurant after your delicious food!