Heat ghee or oil in a heavy-bottomed pan over medium heat.
Add chopped onion and diced bell pepper, sauté until softened and lightly golden.
Stir in garlic and ginger paste, cook for 1-2 minutes until fragrant.
Add chopped coriander stalks, tomato puree, mixed powder, and tandoori masala. Cook for 3-4 minutes, stirring constantly.
Pour in base sauce and bring to a simmer. Cook for 8-10 minutes to reduce and thicken.
Remove from heat and stir in yogurt, fresh coriander leaves, lime juice, and sliced chilli.
Season with salt to taste and serve immediately.