In a dutch oven or other heavy pan, heat up the oil, add onion and cook for 3 minutes until translucent
Add tomato paste, lentils, and can of tomatoes
Stirr and let it cook for another 3 minutes
Add water or broth, cover and let it cook for about 20 minutes
Add coconut milk, salt and pepper and cook for another 10 minutes
Adjust seasoning
At this time you can use immerse blander and blend some of the soup (or as much as you like; I like it a little chunky so I only pureed a little bit to give it texture)