Heat oil in a large saucepan over medium-high heat. Add onion and next 5 ingredients (through bay leaf) to pan; saute 12 minutes.
Add lentils; cook for 2 minutes, stirring constantly.
Stir in broth, 1 cup water and tomatoes; bring to a boil. Cover, reduce heat, and simmer 40 minutes or until lentils are very tender. Remove from heat; let stand for 5 minutes. Discard bay leaf.
Place 3 cups lentil mixture in a blender. Remove center piece of blender lid to allow steam to escape; secure blender lid and place a paper towel over lide to avoid splatters. Blend until smooth and return pureed mixture to pan.
Stir in juice, salt and 1/4 tsp pepper. Sprinkle with remaining pepper.