Spiced Lentil Soup With Walnuts and Cilantro

Name: Spiced Lentil Soup With Walnuts and Cilantro
Ingredients: 2 large yellow onions, chopped; 1 carrot, chopped; 5 cloves garlic, chopped, divided; ½ cup olive oil, divided; 1 tablespoon ground cumin; 1 teaspoon ground coriander; ½ teaspoon ground cinnamon; 1 ½ teaspoons kosher salt, divided; 1 cup red, brown, or green lentils, rinsed and picked over; 8 cups low-sodium chicken or vegetable broth; ¼ teaspoon freshly ground black pepper; 1 tablespoon fresh lemon juice plus 1 tsp. zest (from 1 lemon); ⅓ cup chopped walnuts; ⅓ cup chopped fresh cilantro leaves and stems