Add the oil to the Instant Pot and press SAUTE.
When screen reads HOT, add onion, carrot and celery and cook for about 8 min, stirring often.
Add garlic and cook 2 min more.Press CANCEL Add broth, then lentils, spices and bay leaves. Give it a good stir
Pour the canned tomatoes on top, but do not stir in.
Put the lid on, turn venting knob to SEALING.Press PRESSURE COOK, and set timer for 30 min. Once time is done, let the timer count up for 10 min, to allow for natural pressure release
Carefully turn steam knob to VENTING and let all pressure release.Once it’s done, open the lid and stir the soup well. Remove the 2 bay leaves and discard.
Using an immersion blender, puree soup until almost but not quite creamy. Some small chunks are good for this soup consistency
Taste and adjust salt and pepper to your liking.
Stir in the zest and juice of the lemon
Ladle into bowls, top with some basil and serve with crusty bread