Heat oil in a large frying pan over high heat. Add sage and cook for 1 minute or until golden and crisp. Transfer to a plate lined with paper towel to drain. Reduce heat to medium-high. Add pork and cook for 4 minutes on each side or until golden and just cooked through. Transfer to a plate and cover to keep warm.
Add butter to pan and cook for 2 minutes or until melted. Add apple and cook, stirring, for 7 minutes or until almost tender. Add sugar, stirring to combine. Add cider and bring to the boil. Boil for 2 minutes or until reduced by one-third.
Add cream and mustard to pan, stirring to combine. Add pork and any resting juices to pan. Simmer for 2 minutes or until sauce thickens and pork is warmed through. Season to taste.
Meanwhile, place beans in a saucepan of boiling water and cook for 2 minutes or until just tender. Drain and set aside.
Place pork on plates, spoon over sauce and apple, top with sage and serve with beans.
This dish is great with mash or crusty bread to mop up the juices.