Prepare the ingredients: peel and finely chop the red onion and garlic, rinse the cranberries, and finely chop the tarragon.
In a medium saucepan, heat the olive oil over medium heat. Add the chopped red onion and sauté for 3-4 minutes, until translucent.
Add the chopped garlic and sauté for another minute, until fragrant.
Pour in the tomato puree, then add the cranberries, sugar, salt, and pepper. Mix well to combine.
Bring the sauce to a simmer, then reduce the heat to low and cook for 15-20 minutes, until the sauce has slightly thickened and the flavors have melded.
Add the finely chopped tarragon and cook for another 2 minutes, allowing the flavors to infuse.
Taste the sauce, and adjust the seasoning as needed, adding more sugar for sweetness or cranberries for a more tart flavor.
Let the sauce cool slightly, then serve with pasta, meat dishes, or grilled vegetables.
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