Finely chop the onion. In a medium saucepan, melt the butter over medium heat.
Add the chopped onion and sauté for 4-5 minutes, until translucent and lightly golden brown.
Sprinkle the flour over the onions and stir well to combine, ensuring there are no lumps.
Pour in the beer while continuously stirring to create a smooth sauce. Simmer over low heat for 5-6 minutes, allowing it to thicken slightly.
Stir in the mustard and heavy cream, then season with salt and pepper. Cook for an additional 3-4 minutes to allow the flavors to meld.
Before serving, whisk the sauce thoroughly and serve warm.
This sauce is excellent with grilled meats, roasted vegetables, or even juicy burgers. Store in an airtight container in the refrigerator for 2-3 days.
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