Turkish Red Lentil Soup

My mother-in-law made this fabulous soup while we were in Connecticut, for the annual 'Bethlehem dinner' on Christmas Eve.  I fell in love with the delicious flavors of the soup and asked for the recipe when we returned back home.  She sent me the recipe (from Whole Foods Market) and the only variation I made was to use some chicken broth along with the vegetable broth; it turned out phenomenally well and I will be sure to keep this in rotation. It's very easy to make and is a good, flavorful, vegetarian soup that is enjoyable with warmed pita bread or by itself.

1 1/3 c. (about 8 oz.) red lentils, picked through & rinsed
7 c. vegetable broth (I used 4 c. vegetable broth, 3 c. chicken broth)
1 large onion, diced
1-2 large carrots, diced
4 cloves garlic, finely chopped
2 Tbl. tomato paste
1 tsp. cumin
1/8 - 1/4 tsp. cayenne pepper (or to taste)
3/4 tsp. salt (or to taste)

1.  In a large pot, combine lentils, broth, onion, carrot(s), garlic, tomato paste, cumin and cayenne.  Bring to a boil over high heat.  Lower heat and simmer, uncovered, until vegetables are very tender and lentils begin to fall apart (about 25 minutes).
2.  Remove pot from heat and use an immersion blender to blend the soup until it is creamy but not completely pureed.  Add salt and serve with warmed pitas.