Red Lentil and Chickpea Soup with Sweet Potatoes

Name: Red Lentil and Chickpea Soup with Sweet Potatoes
Ingredients: ½ large onion (diced); 1 leek (chopped (mostly white part)); 2 garlic cloves (chopped); 2 celery stalks (finely diced); 2 tablespoons oil; 1 teaspoon salt; 2 large sweet potatoes (peeled and cubed); 32 ounces vegetable broth; 1 cup red lentils (rinsed); 26 ounces chopped tomatoes (I like Pomi tomatoes.); 1 cup water; 1 teaspoon fresh ginger (grated); 1 teaspoon coriander; 1 cup cooked chickpeas (drained); 1 teaspoon lemon juice; 2 tablespoons fresh cilantro (chopped); 1 tablespoon fresh parsley; 1 cup cashew cream; ½ teaspoon harissa