Instant Pot Pork Sirloin Roast Recipe: Pressure-Cooked Herb-Infused Succulence

This pressure-cooked method transforms pork sirloin into fall-apart tender perfection with minimal effort. The Instant Pot locks in juices while infusing the meat with aromatic herbs and spices.

I’ve refined this approach to ensure a moist, flavorful roast every time—no dry, tough cuts here. A simple sear before pressure cooking deepens the flavor, while the herbs create a fragrant crust.

In under 90 minutes, you’ll have a succulent main course that rivals slow-roasted versions. The natural juices form a rich, savory base for gravy or au jus.

Serve with roasted vegetables or mashed potatoes for a complete, satisfying meal. This method delivers consistent, restaurant-quality results with ease.

Ingredients for Instant Pot Pork Sirloin Roast

Transform pork sirloin into restaurant-quality perfection with these aromatic, flavor-packed ingredients.

The pork sirloin is the foundation—look for even marbling and a vibrant pink color at the butcher counter or Whole Foods. Avoid pre-cut roasts with excessive fat caps, as they won’t render properly under pressure. For the herbs, fresh is non-negotiable; dried simply won’t deliver the same aromatic intensity. Trader Joe’s has surprisingly good fresh rosemary and thyme if your local market’s selection is lacking.

No white wine? Substitute with additional chicken stock plus 1 tbsp apple cider vinegar for acidity. Swap Dijon for whole-grain mustard if that’s what’s in your fridge. The butter can be replaced with olive oil for a dairy-free finish, though the flavor profile will shift slightly. For extra depth, add a splash of balsamic vinegar to the braising liquid.

Store the pork in its original packaging for up to 3 days in the fridge before cooking, or freeze for 6 months. The finished roast keeps well, refrigerated, for 4-5 days and reheats beautifully in its juices. Fresh herbs can be wrapped in damp paper towels and stored for 1 week.

Step-by-Step Instructions for Instant Pot Pork Sirloin Roast

Master the pressure cooker method for perfectly tender pork with minimum effort and maximum flavor.

Step 1: Sear and Season the Pork Sirloin Roast

Set your Instant Pot to the Sauté function on Normal heat. Add the 2 tbsp olive oil and let it shimmer. Pat the 2.5 lb pork sirloin roast dry with paper towels, then season aggressively on all sides with the 1.5 tsp kosher salt and 1 tsp freshly ground black pepper.

Sear the roast for 3-4 minutes per side until deeply browned. The goal is a rich crust that will translate to layered flavor in your finished dish. Remove the roast and set aside temporarily—those fond bits at the bottom are flavor gold.

Step 2: Build the Aromatic Foundation

In the same pot, add the quartered yellow onion, chunked carrots, 6 cloves garlic, 2 tbsp fresh rosemary, and 2 tbsp fresh thyme. Sauté for 2-3 minutes until the onions begin to soften and the herbs release their fragrance.

Pour in the 0.5 cup dry white wine and deglaze the pot, scraping up all those browned bits with a wooden spoon. This step ensures nothing burns during pressure cooking and builds the base of your sauce. Add the 2 pieces bay leaves and 1 tbsp Dijon mustard, stirring to combine.

Step 3: Pressure Cook to Tenderness

Return the seared pork sirloin roast to the pot. Pour in the 1 cup chicken stock, ensuring it pools around the roast but doesn’t submerge it completely. Secure the lid, set the valve to Sealing, and cook on High Pressure for 45 minutes.

The cooking time is perfect for this cut—long enough to break down the connective tissue without overcooking. Once the cycle completes, allow a natural pressure release for 15 minutes, then quick-release any remaining pressure. This gradual release prevents the meat from toughening.

Step 4: Finish with a Rich Pan Sauce

Carefully remove the pork roast to a cutting board and tent with foil. Skim any excess fat from the cooking liquid, then set the Instant Pot back to Sauté. Stir in the 2 tbsp unsalted butter and simmer for 3-4 minutes until the sauce thickens slightly and becomes glossy.

Taste and adjust seasoning if needed—though the initial salt should be sufficient. The sauce should coat the back of a spoon and have a balanced, herb-forward flavor. Slice the pork against the grain and serve with the reduced pan sauce spooned over the top.

Troubleshooting This Dish

Burn Notice

If you see the dreaded Burn error, don’t panic. This usually happens when there’s not enough liquid or when ingredients stick to the bottom. I always add at least 1 cup of liquid, and I deglaze thoroughly after searing to prevent this. 💡

Tough Meat

Ended up with dry or tough pork? This typically means the roast wasn’t cooked long enough under pressure. I recommend extending the cooking time to 50 minutes for a 2.5 lb cut. Also, ensure you’re using natural release for the full 15 minutes.

Sauce Too Thin

For a thicker pan sauce, I let it reduce uncovered on the Sauté function for 5-7 minutes after adding the butter. If it’s still not thick enough, mix 1 tsp cornstarch with 1 tbsp cold water and stir it in while simmering.

Over-Salting

If your dish tastes too salty, balance it by adding a splash of water or stock and a pinch of sugar. The natural sweetness of the carrots and onions can also help counteract excess salt. I learned this trick the hard way after one particularly aggressive seasoning session.

Herb Overload

Fresh herbs can sometimes overpower the dish. If this happens, remember that 2 tbsp each of rosemary and thyme is the sweet spot for this recipe. You can also remove the herb stems before serving if the flavor is too intense.

Pressure Release Issues

If the pressure won’t release, first check that the valve is set to Venting. Sometimes food debris can clog it—gently tap the valve to clear any blockages. I keep a wooden spoon handy for this. Never force the lid open until all pressure has released naturally. ⚡

Frequently Asked Questions