Pat steak dry with paper towels; season liberally with African Spice Rub and allow to come to room temperature, about 45 minutes.
Preheat oven to 225 degrees F; place steak on wire rack lined sheet pan.
Place internal meat probe into thickest part of the strip steak portion. (Follow Omaha Steaks cooking chart for your desired doneness.) **While porterhouse is cooking in oven, make curried shrimp pearl pasta**
Cook steak until temperature reads 5 degrees F below desired cooking doneness.
Bring a large, heavy cast iron pan to high heat and add grapeseel oil and the steak to the pan, along with butter, thyme, rosemary and garlic.
Sear about 30 to 40 seconds on the first side, then flip steak and butter baste for another 30 to 40 seconds.
Rest steak for 8 to 9 minutes; follow along the bone to remove the filet mignon and the strip. Slice each steak into 1/2” to 1” slices.
Reassemble sliced steak back onto bone and serve atop curried shrimp pearl pasta.