For glaze: In a small bowl, whisk together powdered sugar and 2 to 3 tablespoons lemon juice until smooth. Place cake and rack over a sheet of wax paper. Pour glaze over cooled cake, nudging it over the sides with the back of a spoon to fully coat. Transfer to a serving plate. Let glaze dry 2 hours at room temperature. Decorate cake with candied peel.
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