This week I made a tomato and lentil soup.
I always start by sautéing the vegetables in a little oil before adding the liquid and lentils. You could jump this step to reduce the fat but I think it improves the flavour and is good fat so worth it for me.
I also add a little Parmesan which again could be omitted but as its a hard strong cheese you don't need much.
Here is the recipe