Yield: 6 servings
Heat oil in heavy large saucepan over medium–high heat.
Add onions, celery, carrots, and garlic; sauté until vegetables begin to brown, about 15 minutes.
Add 4 cups broth, lentils, and tomatoes with juice and bring to boil. Reduce heat to medium–low, cover, and simmer until lentils are tender, about 35 minutes.
Transfer 2 cups soup (mostly solids) to blender and puree until smooth.
Return puree to soup in pan; thin soup with more broth by ¼ cupfuls, if too thick.
Season with salt, pepper, and a splash of vinegar, if desired.
Ladle soup into bowls. Garnish with celery leaves.
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