I like this lentil soup because it includes a couple of veggies too. The red lentils are specified in the recipe because they are smaller, rounder, and they do not have the seed coat of brown lentils. However, you can substitute brown lentils if necessary. I just love the spices in this! This is a long list of ingredients, but it involves very little effort. You should be able to have it on the table in an hour or so.