Preheat your oven to 200°C/395°F.
Pat the pork tenderloins dry with a paper towel, then season generously with salt.
Evenly coat both tenderloins with the spice rub, pressing it in on all sides.
Preheat a cast-iron pan over high heat, then add 2 tbsp of neutral oil.
Sear the tenderloins for around 2 minutes on each side, until nicely browned all over.
Turn off the heat and add the chicken stock to the pan to deglaze the base.
Combine the compound butter ingredients in a small bowl and microwave for 30 seconds to melt.
Pour or brush the compound butter evenly over both tenderloins.
Roast for 10-15 minutes, or until the pork reaches an internal temperature of 140°F/60°C. It will rise to 145°F/63°C as it rests.
Rest for 5 minutes, then slice into 2cm rounds and serve.