hi mikka
the curry base i now use was given to me by the guys at Mouchak, St michaels. it involves using spiced water, oil, turmeric and salt boiled with the onions, carrot and green pepper. boiling until soft allow to cool alittle then blend. stage 2 involves frying garlic and ginger puree until golden brown then adding blended tomatoes, chilli powder, mixed powder, coriander, cummin and garam masala and coconut milk for 3-4 mins then adding to the onion base and mixing well. bring to the boil adding some hot water to thin the base. boil for 10 mins then reduce to a simmer until the oil rises. remember that to get the oil to rise you must bring to a rolling boil before reducing to a simmer!
at some point i will post the quantities

regards
gary