In the mixer chutney bowl crush coriander leaves, tomato, onion, chillies, and garlic paste.
Meanwhile in the food processor add the cumin powder, chilli powder, mayonnaise, sour cream.
Add the crushed contents of the mixer, add salt ad sugar and pulse for a few moments. Take care not to beat more than required as the sour cream may separate.
Transfer to a container and store in fridge.
Use within 2 weeks in the fridge.