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Turn the Instant pot to the saute setting.
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Pour olive oil into the pot. Place the meat into the pot, season generously with salt and pepper (this is in addition to the salt and pepper added with vegetables). Add flour to the meat and saute on high until the meat is browned a bit. This takes about 2-3 minutes. Toss meat around so the flour is not visible and the meat browns.
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Add Worcestershire sauce, garlic, and broth. Turn the pot to the manual setting and use the up arrow until the display shows 20 minutes. Place the lid in the locked position with the seal in place and the vent to the closed position. Start the pot.
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While the meat is cooking, Chop the veggies. You should have about 10 cups total of any combination of vegetables listed in the recipe.
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When the timer goes off and the meat is finished cooking, let the pressure naturally release for about 10-15 minutes. Release any remaining pressure using the pressure release valve.
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Add the vegetables to the Instant Pot, along with the canned or fresh tomatoes, beef flavoring, salt and pepper and dried herbs. No need to mix yet.
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Set the lid on the Instant Pot and using the "steam" setting, set the steam for 6 minutes. Lock the lid in position and turn the pot on.
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After the vegetables have steamed, manually release the pressure and give the stew a mix. If it is not as thick as you'd like, Remove some of the liquid from the pot (about 1 cup) and place in a cup. Add the tablespoon of cornstarch to the liquid and whisk. Add liquid back to the pot and stir gently. Leave the pot on the warm mode and it will come to a boil, stir until thickened, then turn off pot to serve.