Boil Rice: Boil 1 cup of rice in lightly salted water for exactly 12 minutes. Drain and cool it under running water, then let it drain thoroughly.
1 cup Originario rice
Mix Ingredients: In a bowl, quickly whisk together one egg and ¾ cup of sugar. There's no need to overbeat. Stir in ½ teaspoon of cinnamon, 1 teaspoon of vanilla extract, 1 teaspoon of baking powder, 2 heaping tablespoons of flour, 2 tablespoons of orange liqueur, and the zest of half an orange. Combine well using a spatula.
¾ cup sugar, 1 egg, 2 heaping tablespoons all-purpose flour, 1 teaspoon vanilla extract, 2 tablespoons orange liqueur, Zest of half an orange, ½ teaspoon ground cinnamon, 1 teaspoon baking powder
Combine Rice and Milk: Gently stir in the melted butter, followed by the well-drained rice and 1 ⅔ cups of milk. Mix well.
1 ⅔ cups whole milk, 2 tablespoons unsalted butter
Prepare for Baking: Pour the mixture into a 10 or 11-inch round cake pan lined with parchment paper, which must first be balled up under water and then squeezed hard. Spread the rice evenly in the cake pan.
Bake: Bake in a preheated oven at 350°F (180°C), positioned just below the center, for 60-70 minutes, or until a golden crust forms. The top should feel firm to the touch and not sticky.
Cool and Serve: Turn off the oven but leave the cake inside with the door slightly open for 20 minutes. Then, transfer to a serving plate. It tastes best after a few hours or even the next day. Sprinkle with powdered sugar before serving. The cake keeps well for 2-3 days at room temperature. Freezing is not recommended.