Add oil to medium-size saucepan over medium-high heat. Add onion and saute until transparent. About 5 minutes.
Add tomato sauce and spices. Mix well and simmer over medium-low heat. Cover with lid since it will splatter.
Simmer for at least 10 minutes if being used in a casserole or 30 minutes otherwise
Use a good brand name tomato sauce. I like Hunts.
Do not use more onion.
Use a non-reactive pan with a lid. Usually, that means non-stick.
Good refrigerated for 3-4 days and maybe frozen for 3-4 months.
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