This sauce can be served over meats or vegetables, usually on a bed of rice. In northern India korma is yogurt based, however, this version is not.
Slice onions very thin and boil in water until tender, about 15 minutes; drain water and put onions in a blender.
Add oil, tomato sauce, salt, pepper, coriander and process until smooth; place sauce into a saucepan and bring to a boil.
Turn heat down to low and simmer until thickened.
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