Step 1

In bowl of slow cooker, stir celery, garlic, carrots, leek, sausage, lentils, tomato paste, curry powder, thyme, cumin, salt and pepper until well combined. Stir in broth. Cover and cook on low 8 hours (or on high 4 hours) or until lentils are tender.

Step 2

To serve, divide soup between bowls and top with yogurt and cilantro. Serve with lime wedges and naan.