Melt the salted butter in a small saucepan over medium-low heat.
Add garlic and cook for 30–60 seconds, just until fragrant.
Whisk in Dijon mustard and lemon juice.
Stir in the heavy cream and let it simmer for 1–2 minutes, until slightly thickened.
Add black pepper and fresh herbs if using.
Taste and adjust seasoning. Serve warm over meat, vegetables, or grain bowls.
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