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In a medium saucepan, heat olive oil over medium high heat.
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Add onions and garlic and sauté for four minutes.
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Add remaining ingredients to the pot and stir to combine.
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Bring sauce to a boil, then reduce the heat to low and simmer the sauce for about 30 minutes or until it has thickened slightly, stirring occasionally.
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Once sauce has thickened slightly, remove from heat and carefully place in blender or food processor. Blend until smooth.
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Use immediately or store in the refrigerator for up to 1 week.