Preheat oven to 350 degrees F (175 degrees C). In a small bowl , whisk olive oil with lime juice. Season with cilantro, garlic salt, and peppercorns.
Brush the pork tenderloin with three tablespoons of the lime dressing. Wrap in aluminum foil, and place on in a large baking dish. Roast in preheated oven for 30 to 45 minutes, or until a meat thermometer reads 170 degrees.
While the tenderloin is cooking, place kale in a steamer. Cook for 20 minutes, or until tender.
Slice the pork tenderloin into 1 1/2 inch thick slices. Serve on top of the kale. Whisk the remaining dressing, and drizzle over pork and kale.