This post may contain affiliate links. Full disclosure policy

A simple herb rub with plenty of garlic infuses this Easy Pork Sirloin Roast with can’t-miss flavor! A terrific way to prepare an affordable Costco favorite. Great for family meals or company dinners. So easy! And so good!

Easy Pork Sirloin Roast – Great Recipe for A Costco Favorite!

Whenever I go to Costco, I head straight for the meat department to buy meat, fish, and poultry. They’ve got terrific prices that make it easy to stock up.

One of my favorite items is the four-pack Pork Sirloin Roast. They’re a real bargain and freezer staple for our family.

Each roast weighs about two pounds. That’s the perfect size to feed four people, or just my husband and me with leftovers. If we’ve got extra guests for dinner, as happened recently, I make two.

This simple fresh herb rub is one of my favorite ways to prepare pork sirloin roast. It’s crazy easy and the results are always tender, juicy, and mouth-wateringly flavorful. It’s second only to my Perfect Boston Butt Pork Roast.

However, this pork sirloin was my recipe of choice for the final company dinner I hosted in our old house. It earned rave reviews and requests for second and even third helpings. It’s that good! And so easy.

Scroll down and you’ll see what I mean.

Ingredients for Easy Herb Rub Pork Sirloin Roast

Though I made two roasts when I photographed this recipe, the amounts you’ll find in the recipe below are for one roast. Just double it up if you want to cook an extra pork sirloin roast.

Pork Sirloin Roast – Weight should be about a pound and a half to two pounds. Costco’s prices are hard to beat, but you can buy at any supermarket. Just make sure that your pork sirloin roast is boneless. Cooking times would be very different for a bone-in cut.
Garlic – Slivered, peeled garlic cloves will actually be stuffed into the roast to help infuse it with flavor. It adds a lot, so I wouldn’t skip this part.
Fresh Herbs – I love rosemary and thyme for this recipe. With its robust flavor and fragrance, rosemary in particular brings a lot to the party. But you could also use other fresh herbs, including oregano, sage, or even tarragon. Parsley can work too, but it’s fairly mild in flavor, so be sure to pair it with a more strongly flavored herb if you use it.
Dry mustard – Powdered mustard combined with the herbs adds a nice little zing to the rub. If you dislike mustard, you could substitute smoked or regular paprika.
Olive oil – You can also sub just about any neutral-flavored oil, including vegetable, corn, canola, grapeseed, or safflower oil.
Kosher salt – Kosher is my go-to choice for salt. I like the way the coarse grains provide little pops of flavor as I’m eating. If you substitute regular table salt, reduce the amount of salt by about half.
Ground pepper – if at all possible, grind it fresh. It really does taste better.

Prepping and Cooking Easy Pork Sirloin Roast

This is such a simple and delicious recipe. The instructions below are straightforward and practically foolproof. But I do have a couple of tips.

The first step is to pat the pork sirloin roast dry with clean paper towels. That will make it easier for the meat to absorb the flavors of the herb rub.

As I said, garlic adds a lot to this recipe, so don’t skip that part. And if you want to add extra garlic, feel free to add an additional clove or two. You’d have a hard time using too much.

Be sure to use large, peeled garlic cloves, and slice each one into three or four slivers.

Use the tip of a sharp knife to cut pockets into the roast, and stuff a garlic sliver into each pocket. Don’t be afraid to make some of the pockets deep. You want the garlic flavor to infuse deep into the roast, not just on the surface.

The herb rub goes on next. After applying it, let the pork sirloin roast sit in the fridge for at least an hour before cooking. If you have time, let it sit for several hours or even overnight. More time to rest and absorb the rub will give you an even more flavorful result.

After taking it out of the oven, let the roast rest on the counter for ten to fifteen minutes before slicing. That will give the juices time to absorb back into the meat, which will make it more tender. If you’re worried about it getting too cool, tent the roast with foil while it rests.

What To Serve with Easy Pork Sirloin Roast

Turning this recipe into a one-pan dinner is easy.

Cut up potatoes, onions, or other root veggies and put them in the bottom of the roasting pan. Then drizzle on some olive oil, sprinkle with a little Kosher and fresh ground pepper, and give them a stir. If you like, you can stir in a few more chopped herbs as well.

Place the pork roast on a rack over the veggies. As the pork roast cooks, those lovely herb and garlic juices will drip down onto the vegetables to help flavor them. Cooking your main dish and side dish simultaneously is a huge time saver.

Serve slices of the pork alongside the potatoes or veggies. Add a green salad and some nice, crusty bread, and dinner is served!

This easy pork sirloin roast is a satisfying meal your friends and family will love. Give it a try soon!