A domestic hob (medium gas burner ring) is about 1.8kW and should be ample to heat and maintain oil at 180C when a little spice paste is added. A large gas ring is about 3kW
Then clearly you have not measured it. Most people add onions, garlic, ginger and then the powdered spices/spice paste and tomato puree. By which time the pan will be about 85C (ive measured it). Question is, is this hot enough?
Seems to me that some people think that anything will do because its personal preferance but, from what I can tell, noone here can actually fully replicate a the taste and smell of a bir curry. Is it any wonder i ask myself? :
Despite having onion, garlic, ginger and tomato paste in the pan, if most of the liquid (from the onion) has evaporated ...
and you're now actually
frying the contents
and you havn't overloaded the pan
and your pan is wide enough
and you've got a reasonable size burner
.. then, an oil temperature of 180C should be easily attainable. Now add the spices.
The only reason water is added to the spice mix is to help prevent burning the spices .... if the oil is
too hot.
Once you have gained a little more experience, you will find that you can judge when the oil is at the correct temperature and you will then be able to add the ground spices without water.
Hope this helps Rai.
SnS ;D
ps: Only one green cardamom is used to test temperature, but again, with experience this is method is not needed (waste of a good cardamom eh?)