Trim the pork tenderloin and season generously with salt and pepper. Rub with a little olive oil.
Heat the olive oil in a skillet over medium-high heat. Sear the pork tenderloin on all sides for 2-3 minutes, until nicely browned.
Add the chopped garlic and rosemary to the skillet and cook for another 1-2 minutes, allowing the flavors to meld.
Pour in the red wine and let it simmer for 2-3 minutes, allowing the alcohol to evaporate.
Stir in the heavy cream and mustard, mixing well to combine. Simmer for another 5-7 minutes, or until the sauce has thickened to your liking.
Serve the pork tenderloin with the creamy mustard sauce and a side of your choice, such as steamed vegetables or mashed potatoes.
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