Prepare the ingredients: peel and finely chop the red onion and garlic. Roughly chop the tarragon. Lightly toast the sesame seeds in a dry skillet until fragrant.
In a medium saucepan, melt the butter over medium heat. Add the chopped red onion and garlic and sauté for 3-4 minutes, or until softened and translucent.
Pour in the red wine and stock. Add the brown sugar, salt, and pepper. Stir well to combine and bring the sauce to a simmer.
Once simmering, reduce the heat to low and cook for 15-20 minutes, or until the sauce has reduced and thickened slightly, and the alcohol has evaporated.
Add the toasted sesame seeds and fresh tarragon. Simmer for another 5 minutes to allow the flavors to meld.
Taste the sauce and adjust the seasoning with more salt or sugar if needed. For a smoother sauce, strain it through a fine-mesh sieve or blend until smooth.
Let cool slightly before serving with meat dishes. Store in an airtight container in the refrigerator for 3-4 days.
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