Try Muraina gajak available at Kaleva Sweets.
Jai balaji gajak bhandar
T-47, Khanna Market, 4, Balraj Khanna Marg, Block T, West Patel Nagar, New Delhi
The local stores muraina gajaks are the best
Bengal Sweet House, Vasant Vihar and Aggarwal Sweets, Munirka are known for serving some good gajak
Evergreen in Green Park Market, Kothi Shri Mandir in Khari Baoli, Lalaji Dry Fruit in Lajpat
Near gol market karol bagh
Best place to get them is CHANDNI CHOWK