Wrap each filet with butcher's twine to create a uniform round shape, securing tightly and trimming excess twine.
Season all sides of each filet with kosher salt, then all-purpose seasoning. *Be careful with what other seasonings that you use besides salt. Many seasoning blends will burn on the high heat griddle during the searing process.
Preheat your Blackstone griddle with one zone on medium-high heat and another on low heat.
Add about 1-2 tablespoons high-heat oil to the high-heat zone and wait until it begins to smoke.
Place filets on the smoking griddle and sear for 3-4 minutes on the first side, or until a nice browned crust develops.
Flip steaks to a new spot on the griddle, and sear the second side for an additional 3-4 minutes.
Begin the roll technique, rotating steaks on their edges every 30-60 seconds to cook evenly.
When internal temperature reaches 100-110°F, move steaks to the low-heat zone. In a small pan on the low-heat zone, melt 1 stick of butter with pressed garlic.
Baste steaks with garlic butter and continue cooking until desired internal temperature is reached (130°F for medium-rare).
Remove from griddle and let rest for 5 minutes before serving.