INGREDIENTS
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2 cups store-bought tangerine-orange juice blend
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3 cups finely ground store-bought shortbread cookies (about 12 ounces)
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5 teaspoons finely grated lemon zest, plus 3 tablespoons fresh lemon juice
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1 cup sugar
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1/4 cup (1/2 stick) unsalted butter, melted
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2 teaspoons unflavored gelatin
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1/8 teaspoon cream of tartar