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Preheat oven to 350°F (175°C). In a mixing bowl, whisk together flour, cocoa powder, and powdered sugar.
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Add cubed cold butter and blend using a pastry cutter or your fingers until mixture is crumbly.
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Gradually add cold water, one tablespoon at a time, mixing until a dough forms.
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Press dough evenly into mini tart pans and chill for 10 minutes.
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Prick the bases with a fork and bake for 12–15 minutes. Let cool completely.
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Meanwhile, make the curd by whisking pomegranate juice, orange juice, sugar, orange zest, cornstarch, and salt in a saucepan over medium heat.
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Cook, stirring constantly, until mixture thickens (about 5–7 minutes). Remove from heat and stir in butter.
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Let curd cool slightly, then spoon into cooled tart shells.
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Chill in the fridge for 1–2 hours until set.
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Just before serving, top each tart with pomegranate arils and a sprinkle of orange zest.