In a pan, heat ghee and add chopped onions, ginger and garlic.
When they are golden add in tomatoes, red chilly powder, white pepper powder and salt.
Cover and cook on ,low flame until the tomatoes are cooked and most of the liquid is evaporated.
Allow this to cool completely.
Grind it in mixer.
Pass it through a metal sieve to get smoother sauce.
Add the vinegar and mix well.
Store in an airtight jar in refrigerator.