Prep. Preheat oven to 400˚F and line a baking sheet with parchment paper.
Make the glaze. In a medium bowl, whisk together the chamoy sauce ingredients. Then, place the pork tenderloin on your prepared baking sheet and generously coat all sides of the pork tenderloin with the sauce, reserving about half for basting.
Cook the pork. Transfer the baking sheet to the oven and roast for 25-30 minutes, until pork has reached 145˚F internally, basting every 10 minutes with reserved sauce.
Make the salsa. While the pork is baking, combine the salsa ingredients in a mixing bowl and stir to combine. If needed, adjust seasoning with salt & pepper, to taste. Set aside.
Rest and serve. Remove the cooked pork from the oven and allow it to rest for 5-10 minutes to allow the meat to retain its juices. Then, slice the pork and top with mango salsa before serving.