Preheat your oven to 425 degrees with your Cast Iron Pan on the middle rack
Season the outside of the tenderloin liberally with salt and pepper
Mix the garlic, horseradish, salt, olive oil and chives together to form a paste
Butterfly the tenderloin open and spread the paste all over the inside. Roll it back up and tie it up with butcher twine
Remove the pan from the oven and place it over a burner on high. Sear the tenderloin on each side for 2-3 minutes until well browned
Cook for approximately 15 minutes per pound for medium rare and 20-22 minutes per pound for medium. Use a meat thermometer to ensure you don't overcook the tenderloin
After removing, tent with foil and let it rest for at least 10 minutes
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