Preheat oven to 350 F.
Butterfly the pork tenderloin: slice the pork in half horizontally almost but not all the way through, and open like a book.
1 pork tenderloin
Place the open “book” of pork between two sheets of waxed paper or plastic wrap, and use a meat tenderizer to pound to a even thickness. You should end up with a rectangle of pork.
Arrange the sausage in a line lengthwise down the middle of the pork rectangle. Roll up the pork loin around the sausage, and tie it with twine.
2 Italian sausages
Season the loin to taste with salt and pepper.
Sea salt and freshly ground black pepper
In large oven-proof skillet, melt the cooking fat over medium-high heat and brown the pork on all sides (2 to 3 minutes).
Cooking fat
Place in the oven and bake for 20 to 25 minutes.
While the tenderloin is cooking, put the carrots and potatoes in a pot of water and bring to a boil. Cook the vegetables for about 20 minutes or until tender. Drain.
3 carrots, 1 sweet or russet potato
In a food processor, purée carrots, potato, and curry until smooth, and season with salt and pepper to taste. The mash is now done, so set it aside until you’re ready to serve everything.
3 carrots, 1 sweet or russet potato, 1 tbsp. curry paste, Sea salt and freshly ground black pepper
Transfer the tenderloin to a cutting board, cover with foil, and let rest about 5 minutes before slicing.
While the tenderloin is resting, heat the olive oil in a small saucepan over medium heat and, cook the shallots 5 to 10 minutes, stirring frequently.
2 shallots, 4 tbsp. olive oil
Add the Dijon mustard, balsamic vinegar, and salt and pepper to taste.
1 tsp. Dijon mustard, 2 tbsp. balsamic vinegar
Whisk until well emulsified and remove from heat.
Serve the sliced pork on top of the carrot purée, topped with arugula, and drizzled with the balsamic-shallot sauce.
Arugula salad, Sea salt and freshly ground black pepper