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Press the SAUTE button on the Instant Pot. Once it's hot, add the olive oil then add the ground meat. Cook and crumble the meat until it is browned and cooked through (about 3-4 minutes). Drain any excess grease.
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Stir in the shallots, garlic, salt, pepper, oregano, basil and tomato paste and cook until fragrant, about 2-3 minutes.
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Break up the spaghetti noodles, then place in the pot over the meat in 2-4 layers criss-crossed (to prevent sticking).
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Pour the sauce and diced tomatoes and water covering the noodles. Do not stir and push the noodles down to ensure they are completely submerged in the liquid.
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Cover with lid and set the valve to sealing. Press MANUAL or PRESSURE COOK and set to HIGH pressure for 7 minutes.
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Allow the Instant Pot to come to pressure and do it's thing.
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After the cooking time is up and you hear a BEEP, do a quick release by pushing the valve to RELEASE using a towel (to avoid mess) or a long wooden spoon with a towel covering the vent.
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Carefully open the lid then sprinkle in some Parmesan. Do not stir and allow to sit for 1-2 minutes for the cheese to melt and the pasta sauce to thicken up.
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Serve with Parmesan cheese and fresh parsley and/ or basil, if desired.