Heat oil in heavy large wide pot over medium heat. Add onions; sauté until tender and deep brown, about 20 minutes. Transfer 1/2 cup onion slices to small bowl and reserve. Add carrot, cumin, and garlic to onions in pot; stir 1 minute. Stir in rice. Add broth; bring to boil. Reduce heat to low; cover and simmer until rice is tender and most liquid is absorbed, about 15 minutes. Stir spinach into rice mixture; cover and cook until spinach wilts, about 2 minutes. Season to taste with salt and pepper. Transfer pilaf to bowl; top with reserved 1/2 cup onion slices.
Per serving: calories, 287; total fat, 5 g; saturated fat, 1 g; cholesterol, 0 mg Nutritional analysis provided by Bon Appétit