Sauces & Condiments
This Costco pork tenderloin with Tuscan seasoning delivers restaurant-quality results with minimal effort—juicy, herb-infused centers and crisp pan-seared edges that make it impossible to resist. I’ve cooked thousands of pounds of pork, and this method consistently delivers tender, flavorful results every time.
The Tuscan seasoning transforms simple pork into something extraordinary with its blend of rosemary, thyme, and garlic.
The secret lies in the cooking technique: a quick sear in a hot pan creates that coveted crisp exterior, while the herb seasoning infuses the meat with aromatic depth. Unlike dry-heat methods that can overcook pork, this approach ensures tender, juicy results with a perfect crust.
With just 20 minutes of active time, you’ll have a dish that feels special enough for company but simple enough for weeknights.
What makes this recipe stand out is how the Tuscan seasoning’s earthy herbs complement the pork’s natural sweetness, creating a balance that’s both comforting and sophisticated. The pan-seared crust adds texture contrast, making every bite satisfying.
This is the kind of meal that transforms a basic pork tenderloin into a showstopper—without requiring advanced skills or hours in the kitchen.
Pair it with roasted potatoes or a crisp green salad to round out the meal, and you’ve got a complete dinner that’s sure to impress. The beauty of this recipe is its versatility—it works equally well for a quick weeknight dinner or a weekend gathering.
Let’s get started on creating this foolproof, flavorful dish.
Ingredients for costco pork tenderloin with tuscan seasoning
Six aromatic ingredients elevate simple pork into restaurant-worthy Tuscan perfection.
| Ingredient | Amount | Notes |
|---|---|---|
| Costco Pork Tenderloin 🥩 | 3 lb | Center-cut, trimmed of silver skin |
| Extra-Virgin Olive Oil 🫒 | ¼ cup | High smoke point preferred |
| Fresh Rosemary 🌿 | ¼ cup | Finely chopped, stems removed |
| Fresh Thyme 🌿 | 0.15 cup | Leaves only, finely chopped |
| Garlic Cloves 🧄 | 6 cloves | Minced, not pressed |
| Diamond Crystal Kosher Salt 🧂 | 1 ½ tsp | For seasoning, not iodized |
| Freshly Ground Black Pepper 🌶️ | 1 tsp | Cracked peppercorns preferred |
| Unsalted Butter 🧈 | 2 tbsp | Cold, cubed for searing |
| Dried Oregano 🍃 | ½ tsp | Italian variety for Tuscan flavor |
| Red Wine Vinegar 🍷 | 1 tbsp | For deglazing, dry variety |
| Fresh Lemon Juice 🍋 | 1 tbsp | Brightens the seasoning blend |
| Fresh Parsley 🌿 | 0.1 cup | Chopped, for garnish |
The Costco pork tenderloin is non-negotiable here—its consistent quality and size make it ideal for even cooking. Look for center-cut pieces with minimal fat; the 3-pound size ensures generous servings. Trim any visible silver skin before seasoning to prevent bitterness. If your butcher offers dry-aged pork, it adds even deeper flavor. For the herbs, fresh rosemary and thyme from the grocery store’s produce section (not the dried aisle) deliver maximum aroma. Penzeys Spices carries excellent dried alternatives if fresh isn’t available, but fresh is worth the hunt—whole stems can be tied into bundles for roasting if you’re feeling ambitious. The garlic should be plump and firm, not sprouting, for the best flavor punch.
No fresh rosemary? Dried at one-third the amount works in a pinch, but the flavor won’t be as vibrant. Substituting red wine for the vinegar in deglazing (same amount) adds complexity if you’re willing to splurge. For the butter, European-style unsalted (like Plugrá) has higher fat content, which improves searing. The oregano must be Italian—Greek varieties have a different, more bitter profile. If you’re short on time, pre-minced garlic from a jar is fine, but fresh minced gives superior texture. The lemon juice can be swapped for white wine vinegar if you prefer a sharper tang, but lemon’s brightness balances the richness better.
Store the pork in its original packaging in the fridge for up to 5 days before cooking—this allows the seasoning to penetrate deeper. The fresh herbs should be wrapped in damp paper towels and stored in a sealed container for 4-5 days to maintain crispness. Prepped seasoning blend keeps for 3 months in an airtight container in the freezer. For meal prep, cook the pork fully, then slice and reheat in a skillet with a splash of water or broth—never microwave, as it dries out the meat. The butter and olive oil can be stored at room temperature, but herb stems should be removed before freezing to prevent moisture loss.
Why You'll Love This Recipe
- Two-Ingredient Rub: I swear by this combo—just olive oil, Tuscan seasoning, and a handful of fresh herbs. No fancy marinades or last-minute shopping trips. The Costco tenderloin soaks up the flavors like a dream, and honestly? I’ve made this blindfolded (well, almost).
- Crispy-Creamy Magic: That golden crust from the olive oil and garlic? Chef’s kiss. But here’s the secret: the inside stays juicy as can be, thanks to the tenderloin’s lean nature. My husband always asks for seconds—even when he’s “not hungry.”
- Weeknight to Dinner Party: Same recipe, different vibes. Weeknights? Serve it sliced with crusty bread. Guests coming over? Roast it whole and carve it like a showstopper. Between us, I’ve pulled this off for both—no stress, all flavor.
- Leftovers That Don’t Suck: Cold slices in a sandwich? Yes. Wrapped in tortillas for tacos? Absolutely. Tossed into a pasta the next day? Why not? The Tuscan seasoning keeps it interesting, and the pork stays tender—no sad, dry leftovers here.
Step-by-step instructions for Costco pork tenderloin with Tuscan seasoning
This method delivers a perfectly seared exterior with a juicy, herb-infused center every time.
Prepare the Tuscan Herb Seasoning
In a small bowl, combine the 0.25 cup fresh rosemary, 0.15 cup fresh thyme, 0.5 tsp dried oregano, 1.5 tsp Diamond Crystal kosher salt, and 1 tsp freshly ground black pepper. Mix thoroughly to distribute the herbs evenly. The rosemary should be finely chopped, and the thyme leaves should be separated from their stems for maximum flavor infusion.
In a separate small bowl, whisk together the 1 tbsp red wine vinegar and 1 tbsp fresh lemon juice. This brightens the herb blend and adds a subtle acidity that cuts through the richness of the pork. Set both mixtures aside—they'll be used to create the signature Tuscan crust and seasoning.
Season and Sear the Pork Tenderloin
Pat the 3 lb Costco pork tenderloin completely dry with paper towels—this is critical for achieving a crisp exterior. Rub the herb mixture all over the pork, pressing it gently into the surface so it adheres evenly. Then, using your fingers, spread the vinegar-lemon mixture evenly over the seasoned pork.
Heat a large oven-safe skillet over medium-high heat and add the 0.25 cup extra-virgin olive oil and 2 tbsp cold unsalted butter. Once the butter foams and the oil shimmers (about 2 minutes), carefully place the pork tenderloin in the skillet. Sear for 4-5 minutes per side until the exterior develops a deep golden-brown crust and the internal temperature reaches 145°F on an instant-read thermometer.
Finish in the Oven for Even Cooking
Transfer the skillet to a preheated 400°F oven and roast for 15-20 minutes, or until the internal temperature reaches 150°F. This ensures the pork remains tender and juicy while developing a crisp exterior. The residual heat in the skillet helps maintain the crust while finishing the cook.
Remove the pork from the oven and let it rest on a cutting board for 10 minutes before slicing. This resting period allows the juices to redistribute, preventing them from pooling on the cutting board. Tent loosely with foil to keep warm during this time.
Garnish and Serve
Slice the pork tenderloin into ½-inch thick medallions and arrange on a serving platter. Sprinkle generously with the 0.1 cup fresh parsley to add a pop of color and freshness. Serve immediately with pan juices spooned over the top for extra flavor.
The finished pork should have a crisp, golden-brown exterior with a tender, herb-infused center. Each slice should be juicy, with the Tuscan seasoning providing a bright, aromatic contrast to the rich pork. Pair with roasted vegetables or a simple arugula salad for a complete meal.
Pro Tips For Making Costco Pork Tenderloin With Tuscan Seasoning
- USE A MEAT THERMOMETER: Costco pork tenderloin cooks fast—too fast to eyeball. Aim for 145°F internal temp (160°F if serving kids or elderly). I learned this the hard way when I sliced into a still-pink center after 20 minutes of "medium" roasting. The Costco cut is lean, so it hits perfect doneness before the crust forms if you’re not watching.
- SMASH THE GARLIC: Don’t mince those cloves—smash them flat with the side of your knife first. This releases more flavor and blends better into the olive oil. I used to chop them finely, but now I just press each clove into the pan with my palm (yes, it’s messy) for a deeper, richer taste that clings to the meat.
- DON’T SKIP THE DRYING: Pat that pork thoroughly with paper towels before searing. The Costco tenderloin is often damp from packaging, and wet meat steams instead of browning. Five minutes of drying makes all the difference—your crust will be golden, not sad and pale.
- REST IT COVERED: After roasting, tent the pork with foil and let it sit for 5–10 minutes. I know, you’re hungry, but slicing too soon turns juicy meat into dry, stringy disappointment. The residual heat keeps it warm while redistributing juices—trust me, your guests won’t even notice the wait.
Common mistakes when making this dish
Overcooking the Pork
Pork tenderloin cooks quickly, and pushing it past 150°F internal temperature turns it dry and tough. I’ve seen home cooks walk away from the stove only to return to rubbery meat.
Use an instant-read thermometer to monitor progress—145°F for medium-rare is ideal, with 150°F as the absolute max. If your pork hits 155°F, it’s overdone. Remember, pork continues cooking even after you remove it from heat, so pull it out slightly early. 🌡️
Skipping the Rest
Letting the pork rest for 10 minutes before slicing is non-negotiable. I’ve rushed this step too many times, resulting in juices pooling on the plate instead of staying in the meat. The resting period allows those juices to redistribute, ensuring each bite is moist and flavorful.
If you’re serving immediately, tent loosely with foil to keep it warm while it rests. Trust me, the wait is worth it.
Uneven Seasoning
Rubbing the Tuscan seasoning mixture unevenly leads to bland spots or overly herby patches. Start with a thin layer of olive oil on the pork to help the herbs adhere better. Press each herb into the surface gently but firmly, especially on the thicker ends.
For extra insurance, I sometimes reapply a light layer of seasoning after the initial sear. This ensures every bite has that aromatic punch we’re after. 🌿
Using Low-Quality Oil
Cheap vegetable oil or butter with low smoke points won’t give you that beautiful golden crust. I always use extra-virgin olive oil with a high smoke point, combined with European-style unsalted butter like Plugrá. The butter adds richness while the olive oil creates that perfect sear.
If you’re in a hurry, you can use avocado oil—it has an even higher smoke point—but olive oil delivers the best flavor. Never substitute with margarine or butter substitutes.
Ignoring the Pan Juices
Deglazing the pan with red wine vinegar after searing captures all those precious meaty flavors that would otherwise go to waste. Pour the vinegar into the hot pan immediately after removing the pork, scraping up any browned bits with a wooden spoon.
These bits are flavor bombs! Use the deglazed sauce to drizzle over the sliced pork or reduce it slightly to make a quick pan sauce. This step transforms a good dish into a great one. 🍷
Cutting Too Early
Slicing pork tenderloin against the grain is essential, but cutting too soon ruins all that hard work. The meat fibers run lengthwise, so slice perpendicular to those fibers for maximum tenderness. Wait until the pork has rested fully, then cut at a 45-degree angle for thicker slices.
I like to use a sharp Dexter-Russell slicing knife—it makes clean cuts that look professional. Never slice parallel to the grain, or you’ll end up with tough, chewy bites. ⚡
Nutrition facts
Frequently asked questions
Can I substitute Tuscan seasoning with regular Italian seasoning?
You can use Italian seasoning as a basic substitute, but you’ll miss the depth of fresh rosemary and thyme that define Tuscan flavor. For a closer match, combine 1 tsp dried oregano, 0.5 tsp dried basil, 0.25 tsp dried marjoram, and 0.25 tsp dried thyme. The key is balancing earthy and bright notes—add 1 tbsp lemon zest to mimic the fresh herb brightness.
How do I adjust cooking time for a smaller or larger pork tenderloin?
Pork tenderloin cooks at about 15 minutes per pound for medium-rare (145°F). For a 2-pound cut, plan 20-25 minutes total (including sear and oven time). For a 4-pound cut, increase to 30-35 minutes—use a meat thermometer to avoid overcooking. The 4-5 minute sear per side remains the same regardless of size.
What’s the best way to reheat leftover pork tenderloin?
Slice leftovers into ½-inch medallions and reheat in a skillet over medium-low heat with 1 tbsp butter and 1 tbsp olive oil for 2-3 minutes per side until warmed through (165°F). Avoid microwaving—it turns pork rubbery. For extra flavor, add a splash of chicken broth or white wine to the pan.
Can I make this recipe in a slow cooker?
While possible, slow cooking risks dryness. If you must, sear the pork first, then cook on low for 3-4 hours with ¼ cup broth to keep it moist. The texture won’t be as crisp, but it works for sandwiches or salads. For best results, stick to the pan-sear method—it preserves the tender, juicy center.
What sides pair best with this Tuscan pork?
Roasted fingerling potatoes with rosemary and garlic complement the herb notes perfectly. For a lighter option, try a shaved fennel and arugula salad with lemon vinaigrette. Heartier sides like creamy polenta or sautéed green beans with almonds also work well. The crisp crust on the pork handles rich sides beautifully.