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1
Preheat oven to 300 degrees F (150 degrees C).
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2
Bring orange juice, lemon juice, and lime juice to a boil in a saucepan; cook until reduced to about 2 tablespoons liquid, 8 to 10 minutes.
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3
Heat cream and 1/3 cup sugar together in a separate saucepan over medium heat, stirring until sugar completely dissolves, 1 to 2 minutes; remove from heat.
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4
Whisk egg yolks together in a bowl until frothy. Whisk reduced juice mixture into egg yolks until fully combined. Pour cream mixture in gradually, whisking constantly, until thin custard forms.
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5
Strain custard mixture through a fine sieve; divide into six 5-ounce ramekins. Place ramekins in a baking dish; pour in enough boiling water to come half way up the sides of ramekins.
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6
Bake in preheated oven until just set, about 1 hour. Remove from oven, cool slightly, and cover ramekins with plastic wrap; refrigerate at least 4 hours.
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7
Set oven rack about 6 inches from the heat source and preheat the oven's broiler.
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8
Remove plastic wrap from ramekins. Sprinkle 1 tablespoon of sugar in a thin layer over top of each ramekin. Brown sugar under a broiler until golden and caramelized, 30 seconds to 1 minute.
