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1
Finely grate enough orange zest to measure 1 teaspoon. Cut remaining peel and white pith from oranges with a sharp knife, then discard. Cut segments free from membranes, letting them drop into a bowl, then squeeze enough juice from membranes to measure 3 tablespoons, adding it to segments. Add liqueur and 2 tablespoons sugar and toss with segments. Let macerate 20 minutes.
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2
While orange segments macerate, cook tapioca, milk, grated zest, 1/3 cup sugar, and 1/8 teaspoon salt in a heavy medium saucepan over medium heat, stirring, until sugar has dissolved. Bring to a boil, stirring occasionally, then reduce heat to medium-low and gently simmer, stirring constantly, until thickened, about 10 minutes. Drain orange segments in a sieve over saucepan to add liquid to tapioca (reserve segments), then gently simmer, stirring constantly, until tapioca pearls are completely translucent, 20 to 30 minutes.
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3
Whisk together egg yolks in a metal bowl, then gradually whisk hot pudding into yolks. Quick-chill by setting bowl in an ice bath and stirring occasionally until cool (pudding will be very thick).
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4
Beat egg whites with a pinch of salt using an electric mixer until they just hold soft peaks. Add remaining tablespoon sugar and beat whites until they just hold stiff peaks.
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5
Beat cream in another bowl with cleaned beaters until it just holds stiff peaks. Fold whites, then cream, into pudding gently but thoroughly.
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6
Divide orange segments among 6 glasses, ramekins, or small bowls and top with pudding. Chill, covered, at least 1 hour.
