Step 1

Heat oil in a pot over medium-high. Add shallot, carrot, celery, cumin, coriander, and a pinch of salt. Cook, stirring, until vegetables have softened, 4 to 6 minutes.

Step 2

Stir in lentils, tomatoes, and 4 1/2 cups water. Season with salt and pepper. Bring to a boil, then reduce heat to medium-low and simmer, partially covered, until lentils are tender, 40 to 45 minutes.

Step 3

Stir in broccoli rabe (if soup is too thick, add up to 1/2 cup water); cook until tender, about 3 minutes more. Stir in red-wine vinegar, season with salt and pepper, and serve, with more pepper and a drizzle of oil.