Melt the butter in a medium saucepan over medium heat. Sauté the finely chopped onion until translucent, about 3-5 minutes.
Add the white wine and cook until the liquid has reduced by half.
Pour in the heavy cream and stir to combine.
Stir in the chopped fresh tarragon, lemon juice, salt, and pepper.
Simmer the sauce over medium-low heat for 5-10 minutes, or until it thickens to a silky, creamy consistency.
Serve immediately over grilled chicken, fish, or roasted vegetables.
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