Heat oil in a pan over medium heat; add dried Kashmiri chillies and cardamom pods, fry briefly for 30 seconds until fragrant.
Add garlic and ginger paste; cook for 1-2 minutes until fragrant and lightly golden.
Stir in bird's eye chillies, ground cumin, ground coriander, turmeric, Kashmiri chilli powder, and mixed curry powder; cook for 1 minute, stirring constantly.
Mix in tomato puree and base sauce; bring to a simmer and cook for 5-7 minutes, stirring occasionally.
Stir in mango chutney or lime pickle, lime juice, garam masala, and salt to taste; cook for 2 minutes more.
Remove from heat and garnish with fresh chopped coriander before serving.