These baked rice "cakes" are sold in most food shops in Liguria. They are perfect for a party: the rice and spinach mixture can be spooned into the baking dishes up to 1 day ahead and refrigerated until you are ready to bake them.
Preheat the oven to 400°. Bring 4 cups of water to a boil in a 3-quart pot; drop in the rice and 1/2 teaspoon of salt. Cook until almost done; add the spinach; cook until the rice is done. Drain and place in a bowl. Beat in the grana, eggs, nutmeg, and pepper; taste for salt and add some if needed.
Grease 4 4" round baking dishes. Distribute the rice and spinach mixture among them; smooth the top with a spatula. Bake for 30 minutes, unmold, and serve hot or warm. Serves 4