Cauliflower Leek Soup

Name: Cauliflower Leek Soup
Cook time: 45 min
Total time: 45 min
Cuisine: European, Mediterranean, French
Ingredients: 4 tablespoons olive oil; 3 medium leeks, white and light green parts only, sliced, divided; 1 medium head cauliflower, chopped; 1 teaspoon ground coriander; 0.5 teaspoon salt; 0.5 teaspoon ground turmeric; 0.25 teaspoon ground pepper, plus more for garnish; 4 cups low-sodium vegetable or chicken broth; 0.5 cup half-and-half; 1 tablespoon lemon juice; 6 tablespoons whole-milk plain Greek yogurt