Grind together tomatoes and ginger into a smooth paste.

Add curry leaves, green chili, coriander powder, red chili powder, turmeric powder, and salt. Mix well.

Add the tomato and ginger puree. Mix well.

In a separate bowl mix together besan and little water.

Add this mixture to the tomato puree. Add the remaining water. Stir continuously until a boil comes. Then let it cook for about 10-12 minutes more on low flame.