Reduce the Wine & Shallots: In a small saucepan over medium heat, combine the white wine, lemon juice, and minced shallot. Simmer until the liquid reduces by half, about 4 to 5 minutes.

Incorporate the Crème Fraîche: Lower the heat and whisk in the crème fraîche until smooth.

Emulsify with Butter: Reduce heat to low. Whisk in the cold butter, one cube at a time, allowing each piece to melt before adding the next. Continue whisking until the sauce is smooth and velvety.

Strain & Serve (Optional): For an ultra-smooth sauce, strain out the shallots before serving. Drizzle warm over salmon, seafood, or vegetables.