Finely mince the shallot and garlic to ensure they are evenly distributed throughout the sauce.
In a medium saucepan, melt the butter over medium heat. Add the shallot and sauté until translucent.
Pour in the white wine, bring to a boil, and reduce by half to intensify the flavor.
Stir in the Dijon mustard, making sure it's thoroughly incorporated into the sauce.
Pour in the heavy cream and stir until smooth and creamy.
Finely chop the capers, then add them to the sauce and simmer for an additional 5 minutes over low heat.
Season with salt and pepper, stirring thoroughly to meld the flavors.
Let it cool slightly, then serve with grilled fish, chicken, or roasted vegetables.
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