I never met a lentil I didn't like, and any kind will work (yellow, red, green,) in this hearty and filling vegetarian main-course soup. I created it when I found an almost-empty bottle of couscous spices, bought in France a couple of years ago. The product is called "ras el hanout" which I am told translates roughly as "top of the spices," and is a blend of (if my French translation is correct) black pepper, garlic, cinnamon, ginger, mustard, clove, nutmeg, and red pepper. It is available online at http://www.zamourispices.com/raselhanout.html. Complex and unusual, and adds great zip. This is a delicious meal with a simple salad and some crusty artisan bread. It tastes even better 2 days later, and freezes well.