Heat 2 tablespoons oil or butter in a pan. Temper with cumin seeds, nigella seeds and chili flakes.
Add chopped onions and saute till they turn soft.
Add the tomato puree and mix well.
Now add spice powder namely turmeric powder, red chili powder and the prepared achari or pickle spices.
Mix well and cook in medium flame for 12- 15 minutes keeping the pan closed or until oil leaves the sides of the pan. Lower the flame and add well whisked curd. Mix very well. Season with salt to taste.
Add cubed paneer and simmer for 3-4 minutes.
Finally add crushed kasuri methi and remove from flame.
Serve achari paneer warm with butter naan, roti, or steamed basmati rice and salad.