6. Cook Covered
Place the stuffed roast in a roasting pan and cook it covered in the preheated oven at 200 °C. Covering the roast traps the steam and keeps the lean pork loin from drying out while the filling’s aromas develop and penetrate the meat.
7. Add the Cream Mixture and Finish Uncovered
- Mix the 200 ml of whipping cream with the 1 cup of sour cream until smooth.
- Remove the roast from the oven, uncover it, and pour the cream mixture around and over the meat.
- Return the roast to the oven, uncovered, and continue cooking until the meat browns beautifully and the sauce melds with the meat juices released during cooking.
Adding the cream mixture only in the second phase is what gives the sauce its flavor. By that point the roasting aromas of mustard, onion, and ketchup have already developed, and the cream combines with them as it cooks into the meat juices. Finishing uncovered is what browns the surface and thickens the sauce into a creamy gravy.
8. Serve
Let the roast rest briefly before slicing, then serve it with the creamy mustard sauce generously poured over the meat.
Tips and Notes
- Cut deeply but not all the way through. The roast must hold together on the underside to keep its shape in the pan.
- Chop the onion finely. Fine pieces mix evenly into the filling and distribute more easily between the cuts.
- Season with care. The mustard already has a strong flavor, so salt and pepper should complement it rather than overwhelm it.
- Fill every cut. Spread the mixture into the deeper parts of the incisions so the aromas develop between the meat sections.
- Watch the cooking time. Pork loin is lean, and overcooking can dry it out — aim for a thoroughly cooked roast that stays juicy.
- Add the cream in the second phase. This lets the cream mixture combine with the already developed roasting aromas.
- Finish uncovered. The uncovered phase browns the meat and turns the cream mixture into a creamy sauce.
With a juicy pork loin roast, a savory mustard-onion filling, and a creamy sauce made from whipping cream and sour cream, this dish is a hearty, uncomplicated oven classic — robust in flavor, creamy in texture, and perfect for a cozy family meal or a shared weekend lunch.
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