Lower heat to simmer, add tomatoes, onion and celery. Cover and let simmer 45 minutes. Check every 15 minutes to stir, add water if necessary. Add spices last 15 minutes to taste. Taste and re-spice if necessary before serving.
Great recipe easy to cook I put all in my pressure cooker. I didn't have tinned tomatoes so used a cup of left over tomato passata and two large tomatoes. Only took 12 minutes cooking time with French (green) lentils. Great recipe to make 'out of the cupboard' - 21 Oct 2013