Peel and finely chop the onion. Peel and mince the garlic.
Heat the olive oil in a saucepan over medium heat. Add the chopped onion and garlic, and sauté for 2-3 minutes until softened and translucent.
Pour in the red wine and let it simmer for 5-7 minutes, allowing the alcohol to evaporate and the flavors to concentrate.
Add the fresh tarragon, salt, and pepper. Stir well to combine. Cook over low heat for another 5 minutes.
Pour in the heavy cream and stir well. Let it simmer for another 5 minutes, or until the sauce has thickened to your liking.
Serve the sauce fresh over grilled meats such as duck or veal.
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