Cut the pork fillet into medallions. Heat the olive oil in a large pan over medium-high heat. Fry the medallions for 3-4 minutes on each side until browned. Season with salt and pepper. Transfer to a warm plate.
In the same pan, sauté the diced shallot over medium heat for 2-3 minutes until softened. Add the white wine and let it reduce for 2 minutes. Stir in the Dijon mustard and honey, then add the crème fraîche. Simmer for 3-4 minutes until the sauce reaches your desired thickness.
Return the medallions to the pan and let them steep in the sauce for 2 minutes, ensuring the pork reaches an internal temperature of 63°C / 145°F.