Set your Instant Pot to sauté mode and preheat for 2 minutes. Add the oil and Italian sausage. While the sausage cooks break it into smaller pieces using a meat separator. Continue cooking until the meat is browned.
Add the onion, celery and carrot. Cook for 4 -5 minutes. Once the vegetables have started to soften, stir in garlic and seasonings.
Next, add the diced or stewed tomatoes, tomato paste, stock/broth, and lentils. Stir to combine.
Check that the silicone sealing ring is fitted properly into the Instant Pot lid. Place the lid on the Instant Pot and turn it clockwise until it is in the closed position.
Turn the steam release valve to the “sealing” position.
Press the “Manual” button and use the +/- buttons to set the time to 10 minutes.
When the time is up, let the pressure naturally release for 10 minutes, and then do a quick release.
Carefully remove the lid.
Stir in chopped kale/spinach/nettle if using.
Enjoy