01 -
Take your beef tenderloin out of the fridge and let it sit for about 1-2 hours before cooking. This helps it cook more evenly.
02 -
Mix together the softened butter, minced garlic, chopped rosemary, and thyme in a small bowl until well combined. Set this aside for later.
03 -
Heat your oven to 425°F. If your butcher hasn't already done it, cut the tenderloin in half, trim any excess fat, and tie it with kitchen twine to keep its shape.
04 -
Pat the tenderloin dry with paper towels (this helps get a better sear), then generously season both sides with the salt and pepper.
05 -
Heat avocado oil in a large cast-iron pan until it's shimmering hot. Add the tenderloin and brown it on all sides for about 10 minutes total until you've got a beautiful golden crust.
06 -
Slather that delicious herb butter mixture all over the top of your tenderloin. If you have a probe thermometer (highly recommended!), stick it in now. Transfer the whole pan to the oven and roast for 15-20 minutes depending on how you like your meat done.
07 -
Transfer the tenderloin to a cutting board and let it rest for 10-15 minutes - this keeps all those flavorful juices inside! Remove the twine and slice into thick 1-inch pieces. Serve with homemade horseradish sauce if you're feeling fancy!