01 - Melt butter in a medium saucepan over medium heat.
02 - Add minced shallot and garlic; sauté for 2 to 3 minutes until softened and fragrant.
03 - Sprinkle flour over the mixture and cook, stirring continuously, for 1 minute.
04 - Gradually whisk in the white wine, simmering for 2 minutes to reduce slightly.
05 - Add vegetable broth, soy sauce, Dijon mustard, black pepper, and thyme. Whisk thoroughly to combine.
06 - Bring the mixture to a gentle simmer and cook, stirring occasionally, until sauce thickens, approximately 8 to 10 minutes.
07 - Adjust salt to taste. Optionally strain sauce for a smoother consistency. Serve warm.