Step 1

Dice and blend onion, ginger, ginger, chillies to a fine paste.

Step 2

Heat oil in a pan. Once oil is hot add the onion, ginger, and garlic paste to it.

Step 3

Mix well and saute.

Step 4

Saute till onion gets cooked and starts releasing oil .

Step 5

Add coriander powder, red chilli powder, turmeric powder, cumin powder, black pepper powder, salt.

Step 6

Stir and mix them well.

Step 7

Add 2 - 3 tbsp water (if it's too thick at this stage) and cook for 3 - 4 minutes on low flame.

Step 8

Cook till it again starts releasing oil from sides.

Step 9

Keep on stirring periodically.

Step 10

Turn off the heat and let it cool completely.

Step 11

Then transfer to an air tight container and store in refrigerator.

Step 12

Blend tomatoes to puree.

Step 13

Once the mixture of onion paste and ground spices are cooked, add tomato puree.

Step 14

Cook again till the mixture becomes thick and leaves oils on sides.

Step 15

When it's cooked and thick, turn off heat.

Step 16

Cool completely and store in airtight jar.

Step 17

If adding tomatoes, use the sauce by next day (24 - 36 hrs)