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Instant Pot Vegetarian Portabella Pot Roast

Prep Time 15 mins
Cook Time 20 mins
NPR 10 mins
Total Time 45 mins
Course Main Course
Cuisine American
Servings 6


  • 1.25 pounds Yukon gold potatoes cut into bite-sized pieces
  • 1 pound baby bella mushrooms if they are large, cut them in half
  • 2 large carrots peeled and cut into bite-sized pieces
  • 2 cups frozen pearl onions*
  • 4 cloves garlic peeled and minced
  • 3 sprigs fresh thyme
  • 3 cups vegetable stock divided
  • 1/2 cup dry red or white wine
  • 3 tablespoons tomato paste
  • 2 tablespoons vegetarian** worcestershire
  • 2 tablespoons cornstarch
  • Kosher salt and freshly-cracked black pepper
  • optional garnish: finely-chopped fresh parsley


  • Instant Pot Method:
  • Add potatoes, mushrooms, carrots, onions, garlic, thyme, 2.5 cups vegetable stock, wine and worcestershire together in the bowl of a pressure cooker, and gently toss to combine. Close lid securely and set vent to “Sealing”.
  • Press “Manual”, then press “Pressure” until the light on “High Pressure” lights up, then adjust the up/down arrows until time reads 20 minutes. Cook. Then let the pressure release naturally, about 15 minutes. Carefully turn the vent to “Venting”, just to release any extra pressure that might still be in there. Remove the lid.
  • In a separate bowl, whisk together the remaining 1/2 cup vegetable stock and cornstarch until combined. Add to the roast mixture, and gently toss to combine. Continue to cook for 1-3 minutes, until the sauce thickens up a bit.
  • Serve immediately, garnished with fresh parsley if desired.
  • *Feel free to sub in sliced white onions, if pearl onions are not available.
  • **If making this recipe vegetarian, use vegetarian Worcestershire.


Original recipe: https://www.gimmesomeoven.com/portobello-pot-roast-vegetarian/
Keyword Instant Pot
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