Herby Spinach-and-Rice Soup with Turmeric

Cook 2 tablespoons oil and cumin seeds in a small skillet over medium, swirling pan, until seeds are fragrant, darkened slightly in color, and sizzling, about 1 minute. Transfer to a bowl; let cool completely. (Oil can be stored in an airtight container at room temperature up to 1 week.)

Heat a medium saucepan over medium; swirl in remaining 3 tablespoons oil. Add shallots and garlic, season with salt, and cook, stirring occasionally, until translucent, 3 to 5 minutes.

Stir in rice, potato, and turmeric; cook, stirring, 1 minute. Add broth and 1 cup water; bring to a boil. Season with salt, reduce heat, and simmer, partially covered, until flavors meld and potato and rice are cooked and very tender, about 30 minutes. Remove from heat; stir in spinach, herbs, and lemon juice. Season with salt and pepper.

Ladle into bowls. Whisk yogurt and spoon into the soup, along with cumin-seed oil and more herbs and lemon juice; serve.