
Seared sirloin strips go into the Instant Pot first, giving the beef a deep golden crust before it simmers away until fork-tender. Butter-softened onions, garlic, and browned cremini mushrooms build a savory, earthy base, and a spoonful of Dijon mustard adds sharp depth to the sauce. Beef broth does the heavy lifting for that rich, glossy gravy, finished with a generous swirl of sour cream stirred in low and slow so it stays silky instead of curdling. The whole thing comes together hands-off under pressure, so you get that slow-braised flavor in a fraction of the time. Ladle it over your favorite noodles or a pile of mashed potatoes and finish with a scatter of fresh parsley for brightness. It's a comforting, deeply savory dinner that fits neatly into a gluten free rotation.
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Pat the beef strips dry with paper towels, then season evenly with the salt and pepper.
Set the Instant Pot to Sauté (high). Add the butter and let it melt and foam. Working in two batches to avoid crowding, add the beef strips in a single layer and sear for 2 minutes per side, until browned on the outside — the beef will not be cooked through. Transfer the seared beef to a plate and set aside.
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