Heat oil in a large saucepan over medium-high heat.
Add onion and next 5 ingredients (through bay leaf) to pan; saut 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.
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.