Heat a large pot on the stove over medium high heat. Add in olive oil and saute onion in the olive oil for about 5 minutes, until softened. Add in 5 cloves and saute another 30-60 seconds.
Pour in chicken broth, crushed tomatoes, tomato sauce, tomato paste, sugar, fennel, oregano, salt, pepper, basil, and parsley. Bring to a simmer.
Reduce the heat to low and simmer for 1-4 hours. Use an immersion blender to puree the mixture until the desired consistency is achieved, leaving it slightly chunky, or making it completely smooth.
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Notes
This recipe can be used in canning.For easy long term storage, cool and then place into several gallon sized resealable freezer bags. Lay flat on a pan and place in the freezer until solid. Thaw and reheat in the microwave or on the stove to serve.