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Golden, crumbly pastry yields to a remarkably creamy interior where individual grains of rice soften almost to the point of dissolution. Achieving this texture requires boiling the rice gently in milk until the starches fully swell and thicken the liquid. A heavy-bottomed pot prevents scorching during this prolonged simmering phase, though a standard saucepan works adequately if stirred frequently over medium-low heat.
Working the butter into the flour with cold hands creates coarse crumbs before the egg binds the dough into a cohesive mass. Chill this pastry for at least thirty minutes so the fat solidifies, which prevents excessive shrinkage when the lined pan hits the 170°C oven. Roll the dough to a thickness under five millimeters to maintain an ideal ratio between the crisp crust and the dense filling.
Folding whipped egg whites into the cooled rice mixture introduces microscopic air pockets that lighten the dense dairy and starch matrix as it bakes for forty minutes. Whip those whites until stiff peaks form, then incorporate them using a silicone spatula to preserve the trapped volume.
Resting the dessert overnight fundamentally alters its chemistry. The starches fully set and the citrus and liqueur aromatics permeate the rice matrix. Serve slices at cool room temperature after storing them covered in the refrigerator for up to three days.