1. Heat oil in a large saucepan over medium-high heat. Add onion and next 5 ingredients (through bay leaf) to pan; sauté 12 minutes. Add lentils; cook for 2 minutes, stirring constantly. Stir in broth, 1 cup water, and tomatoes; bring to 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.
2. Place 3 cups lentil mixture in a blender. Remove center piece of blender lid (to allow steam to escape); secure blender lid on blender. Place a clean towel over opening in blender lid (to avoid splatters). Blend until smooth. Return pureed mixture to pan; stir in juice, salt, and 1/4 teaspoon pepper. Sprinkle with remaining 1/2 teaspoon pepper.