Step 1

Heat oil in a large heavy pot over medium heat. Add carrots, celery and onion and cook until starting to soften, 7 to 10 minutes. (Do not brown.) Stir in garlic, tomato paste, cumin, saffron and turmeric and cook for 1 minute.

Step 2

Add broth, water, lentils, spinach, salt and pepper. Bring to a simmer. Adjust heat to maintain a simmer, cover and cook, stirring as needed to prevent sticking, until the lentils and vegetables are tender, 15 to 20 minutes. Add more water if desired.

Step 3

Garnish with yogurt and mint, if desired.