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Mississippi Pork Tenderloin - Simple, Tangy, and Ultra Tender

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Prep Time 10 minutes
Cook Time 4 hours
Total Time 4 hours 10 minutes
Servings: 6 servings
Ingredients Method

Ingredients
  

  • Pork tenderloins (1.5–2 pounds total; usually two small tenderloins)
  • Ranch seasoning mix (1 packet, about 1 ounce)
  • Au jus gravy mix (1 packet, about 1 ounce) or brown gravy mix
  • Pepperoncini (8–12 whole peppers), plus a splash of brine
  • Unsalted butter (2–4 tablespoons)
  • Garlic (2–3 cloves, minced) or 1 teaspoon garlic powder
  • Onion powder (1 teaspoon)
  • Olive oil (1–2 tablespoons)
  • Low-sodium chicken broth (1/2 cup)
  • Black pepper
  • Optional add-ins: sliced onion, baby potatoes, carrots, or mushrooms

Method
 

  1. Trim and pat dry. Remove silver skin from the tenderloins. Pat the pork dry with paper towels so it sears well and the seasonings stick.
  2. Season all over. Rub with olive oil, then sprinkle on ranch seasoning, au jus mix, garlic, onion powder, and black pepper. Press it in so it coats the surface.
  3. Sear for flavor. Heat a large oven-safe skillet over medium-high. Add a little oil. Sear the pork on all sides until browned, about 2–3 minutes per side. Browning builds a richer crust and deeper flavor.
  4. Build the sauce base. Pour in chicken broth and 2–3 tablespoons of pepperoncini brine. Scatter the whole pepperoncini around the pork. Dot the top with butter.
  5. Choose your cooking method. For the oven: transfer the skillet to a 400°F (200°C) oven and roast 15–20 minutes, or until the thickest part reaches 145°F. For the slow cooker: skip searing if you want, then cook on Low 3–4 hours or High 1.5–2.5 hours until it hits 145°F. For the Instant Pot: add 1 cup broth, cook on High Pressure for 2 minutes per 1/2 inch of thickness (usually 6–8 minutes), then natural release 10 minutes.
  6. Rest and slice. Move the pork to a board, tent loosely with foil, and rest 5–10 minutes. This keeps the juices in. Slice into 1/2-inch medallions.
  7. Finish the sauce. While the pork rests, simmer the skillet juices for 2–3 minutes to slightly thicken. For a thicker gravy, whisk 1 teaspoon cornstarch with 1 tablespoon water and stir it in. Taste and adjust salt, pepper, or brine.
  8. Serve. Spoon the buttery pepperoncini sauce over the sliced pork. It’s great with mashed potatoes, rice, or roasted veggies to catch the drippings.