After years of experimenting I have found a great and simple way to cut out any base. I simply blitz a tin of carrots in the blender!!! This makes a very cheap, very easy healthy and attractive looking natural orange puree. I add this to the pan after frying off some onions, garlic, ginger, peppers, meat etc then add tomatoes tomato puree and best quality bought curry paste or spices, extras like coconut cream etc can be added later. Try this, a delicious curry can be knocked up in half an hour. PS...I usually need a little stock or water to thin the sauce.