Melt the butter in a medium saucepan over medium heat. Add the minced garlic and rosemary. Sauté for 1-2 minutes, or until fragrant.
Stir in the flour and cook for another minute to form a roux.
Gradually whisk in the heavy cream, ensuring there are no lumps.
Season with salt, white pepper, and lemon juice. Reduce heat to low and simmer for 3-4 minutes, or until the sauce has thickened slightly.
Serve the sauce hot with grilled meats or roasted vegetables.
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