Lentil and Macaroni Soup With Swiss Chard

Ingredients

• 2 tablespoons olive oil
• 1 large onion, chopped (about 1 1/2 cups)
• 1/2 bunch Swiss chard (6 ounces) leaves and stems separated, chopped
• 3 cloves garlic, minced
• 1 1/2 teaspoons ground cumin
• 1 teaspoon ground coriander
• 1/4 teaspoon crushed red pepper flake
• 1 1/4 cups brown or green lentils, picked over thoroughly and rinsed
• 8 cups no-salt-added chicken broth (may substitute vegetable broth)
• One 28-ounce can no-salt-added whole peeled tomatoes, plus their juices
• 1 bay leaf
• 1 teaspoon kosher salt, plus more as needed
• 1/2 teaspoon freshly ground black pepper, plus more as needed
• 1/2 cup dried whole-wheat elbow macaroni