Preheat your oven to 400 F.
In a bowl, combine the pear, walnut, fresh chives, and lemon juice, and season with salt and pepper to taste.
2 pears, ¼ cup walnuts, 1 tbsp. fresh chives, 1 tbsp. fresh lemon juice, Sea salt and freshly ground black pepper
Melt some cooking fat in a skillet over high heat.
Cooking fat
Brown the tenderloin on all sides, about 2 to 3 minutes per side.
1 pork tenderloin
Lower the heat to medium. Add the garlic and onion, and cook until fragrant, about 2 minutes.
2 garlic cloves, 1 onion
Pour in the balsamic vinegar and bring to a boil while frequently stirring and scraping the browned bits from the bottom of the pan.
3 tbsp. balsamic vinegar
Add the chicken stock.
½ cup chicken stock
Drizzle the pear salsa on top of the tenderloin, and bake in the oven for 15 to 20 minutes.
Let the pork rest for 4 to 5 minutes before slicing, and serve with the salsa.