Heat the oil in a pan and fry the ginger, garlic & green chilies for few minutes. Add the onions and fry until dark brown. Then add all the spice powders and mix well. Fry this for few minutes. Add tomatoes and chopped coriander & salt and fry. Add a cup of water and cook for 10 minutes over low heat. Remove from heat and let it cool completely. Then store in an airtight container and freeze.
This comes very handy for working people. Heat some oil in a pan and add this curry paste and fry for few minutes. Then add vegetables or lamb or chicken or fish and fry for few minutes. Add some water and cook until done. For 1/2 kg (1 lb) of vegetables or lamb or chicken or fish use 1/2 the quantity of this curry paste.