Heat a pan over a medium-high heat with a drizzle of oil. Once hot, add the onion with pinch of salt. Fry for 5 min. Add the ginger-garlic paste, cumin seeds, turmeric, coriander powder, stock cube and garam masala. Fry for 2 min. Add the tomato paste, tomatoes, brown sugar and chickpeas. Cook for 5-8 min.