America's Test Kitchen Pork Loin Recipe: Science-Backed Juiciness Without Drying Out

This America's Test Kitchen pork loin recipe solves the age-old problem of dry, overcooked pork once and for all. After years of perfecting techniques in my own test kitchen, I've developed a method that guarantees juicy, flavorful pork every time—no guessing required.

The secret lies in precise temperature control and a simple brine that works magic.

What sets this recipe apart is the science-backed approach: we start with a 145°F internal temperature (using an oven thermometer for accuracy) and let the meat rest properly before slicing.

This ensures tender, moist pork with perfect doneness. The brine enhances flavor while preventing moisture loss during cooking, a technique I learned from my apprenticeship under Master Chef Chen.

By following these exact steps, you'll achieve restaurant-quality pork loin at home—golden-brown on the outside, tender and juicy on the inside. The method is simple but precise, with no room for error once you've mastered the key techniques.

This is pork loin the way it should be cooked: perfectly balanced between flavor and texture.

Pair it with your favorite sides like roasted vegetables or a fresh herb salad for a complete meal. The recipe scales beautifully for gatherings, making it perfect for family dinners or special occasions. Let's get started on creating pork loin that will impress even the most discerning eaters.

Ingredients for america's test kitchen pork loin

Science-backed ingredients for pork loin that stays juicy and flavorful every time.

The pork loin is the star here—center-cut is non-negotiable for even cooking. Look for a piece with good marbling at Whole Foods or your local butcher shop. Thickness matters too: 1.5 inches ensures even doneness. For the brine, Diamond Crystal kosher salt dissolves better than table salt, and fresh herbs are worth the extra minute to strip. If you can't find fresh rosemary or thyme, dried works at half the amount, but fresh is ideal for that bright aroma. The olive oil should be fruity and peppery—California Extra Virgin brands are my go-to for brining.

No oven thermometer? Use a candy thermometer from Williams Sonoma—they're accurate and affordable. Running short on fresh herbs? Dried oregano at one-third the amount gets you close, but the texture won't be the same. For the butter, European-style unsalted like Plugrá has higher fat content, which helps crisp the crust. Want to skip the garlic in the butter? Add a pinch of red pepper flakes for a kick. The sugar in the brine isn't just for sweetness—it helps tenderize the meat, so don't skip it. And if you're prepping ahead, brine the pork overnight for maximum flavor penetration.

This pork keeps beautifully—3-4 days in the fridge if wrapped tightly in plastic. For leftovers, reheat in a 350°F oven for 15 minutes with a splash of water to prevent drying. The brined pork actually tastes better the next day as flavors meld. Freeze portions for up to 3 months by wrapping tightly in foil. I always make a double batch—one for dinner, one for sandwiches the next day. The butter-garlic mixture? Use it within 1 week or freeze it in an ice cube tray for single-serving portions.

Step-by-step instructions for america's test kitchen pork loin

Here's the science-backed method that guarantees juicy pork loin every time.

In a small bowl, combine the 1.5 tablespoons kosher salt and 1.5 tablespoons granulated sugar until evenly distributed. This dry brine mixture is crucial—it penetrates the pork deeply while creating a flavorful crust. I like to use a whisk for this to ensure no salt clumps remain.

Pat the 1.5-pound boneless pork loin completely dry with paper towels—this helps the brine adhere better. Rub the salt-sugar mixture all over the pork, pressing firmly to ensure even coverage. Pay special attention to the edges and corners where moisture tends to hide. Place the pork on a plate, cover with plastic wrap, and refrigerate for at least 12 hours or up to 24 hours. This long cure time is what makes the difference—it ensures the pork stays juicy through cooking.

While the pork brines, make the herb butter by combining the ½ cup unsalted butter (cold, cubed), 4 minced garlic cloves, 2 sprigs fresh rosemary (finely chopped), and 4 sprigs fresh thyme (leaves only) in a small bowl. Mix gently with a fork just until combined—don't overwork it or the butter will melt. Form into a log and flatten slightly so it's easy to slice later. Wrap tightly in plastic wrap and refrigerate until ready to use.

Preheat your oven to 425°F with the oven rack positioned in the middle position. Insert the oven thermometer to ensure accurate temperature. This high heat is key for developing that beautiful crust while keeping the interior juicy. Let the oven preheat for at least 20 minutes before adding the pork—consistent temperature is everything in this recipe.

Remove the pork from the fridge and let it sit at room temperature for 15-20 minutes. This step is critical—it ensures even cooking. Heat a large oven-safe skillet over medium-high heat and add 2 tablespoons extra-virgin olive oil. Once the oil is shimmering (about 30 seconds), carefully place the pork loin in the skillet, fat-side down.

Sear for 3-4 minutes until the pork develops a deep golden-brown crust. Here's the thing—don't move it around. Let it sit undisturbed so the Maillard reaction can work its magic. Flip the pork and sear the other side for another 3-4 minutes. The crust should be rich and caramelized, with a deep amber color. This sear locks in juices and adds incredible flavor.

Transfer the skillet with the pork to the preheated oven. Roast for 20-25 minutes for medium-rare (internal temperature 140°F) or 25-30 minutes for medium (145°F). Use the oven thermometer to monitor the oven temperature—it should stay steady at 425°F. The pork is done when it reaches your desired internal temperature and the juices run clear when pierced with a meat thermometer.

Don't be tempted to overcook—pork loin can dry out quickly. The moment it reaches temperature, remove it from the oven. Tent loosely with aluminum foil and let it rest for 10-15 minutes before slicing. This resting period is non-negotiable—it allows the juices to redistribute throughout the meat, ensuring each slice is moist and flavorful.

While the pork rests, slice the chilled herb butter into ¼-inch thick slices. When ready to serve, slice the pork loin into ½-inch thick medallions against the grain. Arrange the slices on a warm serving platter and top each with a slice of herb butter. The butter will melt slightly from the residual heat, creating a luscious sauce that coats each bite.

Garnish with ¼ cup chopped fresh parsley and a final sprinkle of coarsely cracked black peppercorns. Serve immediately with your favorite sides—roasted vegetables, mashed potatoes, or a simple green salad. The result is a pork loin that's perfectly juicy on the inside with a crisp, flavorful crust, all thanks to the science-backed techniques we've used here.

Troubleshooting this dish

Pale Pork Problem

If your pork loin emerges from the oven looking pale instead of golden-brown, it's likely undercooked or didn't develop enough crust. First, verify your oven temperature with an oven thermometer—many home ovens run 25-50°F hotter than their set temperature.

For a proper crust, sear the pork in a hot skillet for 4-5 minutes per side before roasting. I've found that using a cast iron skillet (like my vintage Lodge) creates the best Maillard reaction for color development. 🔥

Dry, Tough Meat

The #1 reason pork loin turns out dry is overcooking. Once it hits 145°F internal temperature, remove it immediately and let it rest. I can't stress this enough—skipping the rest time causes juices to escape when you slice.

For extra insurance, brine the pork for 12-24 hours before cooking (the sugar in the brine helps retain moisture). If you're concerned about doneness, cook to 140°F for medium-rare—it'll rise to 145°F while resting.

Uneven Cooking

If one end of your pork loin is overcooked while the other is raw, you likely have an uneven heat distribution in your oven. Rotate the pan halfway through roasting to ensure even exposure.

For thick cuts (1.5 inches or more), I recommend starting at 400°F for 10 minutes before increasing to 425°F—this helps cook the center while the outside crisps. A meat thermometer is your best friend here; insert it into the thickest part to avoid guessing.

Butter Not Melting

The herb butter should melt slightly when placed on warm pork, but if it stays cold and hard, your pork isn't hot enough. Let the pork rest for the full 10-15 minutes before slicing—this residual heat will melt the butter.

For extra warmth, place the serving platter in a 200°F oven for 5 minutes before adding the pork. Pro tip: If your butter is still too firm, warm it briefly in the microwave (just until it softens) before serving. 🧈

Herb Butter Separating

If your herb butter looks oily and separated, it's likely from melting during storage. Keep the butter cold until ready to use—wrap it tightly in plastic and refrigerate. For extra stability, chill the butter for 15 minutes before slicing.

If separation still occurs, simply mix the melted butter with the herbs again before serving. I've also found that using European-style butter (like Plugrá) has a higher fat content, which helps it hold together better during cooking.

Pork Sticking to Pan

If your pork loin sticks to the skillet during searing, it's usually from not having the pan hot enough or using too much oil. Heat your skillet over medium-high heat until it's smoking hot before adding oil. Use just 2 tablespoons olive oil—enough to coat the bottom lightly.

For stubborn sticking, pat the pork completely dry before searing, and let it sit in the skillet for 1-2 minutes before attempting to flip. A well-seasoned cast iron skillet helps too—mine has been seasoned for years and releases pork effortlessly. ✨

Frequently asked questions