How Long to Cook Whole Pork Tenderloin (1–1.25 lb) in the cast iron
Specification: 1.25 lb whole pork tenderloin, trimmed and tucked, seared on stovetop then transferred in skillet to 400°F oven
3-Step Execution Protocol
Heat cast iron skillet over 400°F (204°C) Stovetop Sear + Oven until lightly smoking. Prepare whole pork tenderloin (1–1.25 lb) (1.25 lb whole pork tenderloin, trimmed and tucked, seared on stovetop then transferred in skillet to 400°F oven). Spray lightly with high-smoke-point oil.
Cook for 17–22 mins. Flip at the 8-minute mark for even browning.
All 4 long faces are deeply browned; internal core registers 145°F with delicate tenderness Confirm internal temperature reaches 145°F (63°C). Rest for 6 minutes before serving.
America's Test Kitchen Stovetop-to-Oven Tenderloin Protocol & USDA FSIS