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1
Preheat oven to 425u00b0. On a lightly floured surface, roll dough to a 1/8-in.-thick circle; transfer to a 9-in. pie plate. Trim pastry to 1/2 in. beyond rim of plate; flute edge. Refrigerate 30 minutes.
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2
Line unpricked pastry with a double thickness of foil. Fill with pie weights, dried beans or uncooked rice. Bake on a lower oven rack 20-25 minutes or until edges are golden brown. Remove foil and weights; bake 3-6 minutes longer or until bottom is golden brown. Cool on a wire rack. Reduce oven setting to 350u00b0.
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3
In a small heavy saucepan, mix sugar, cornstarch and salt. Whisk in milk. Cook and stir over medium heat until thickened and bubbly. Reduce heat to low; cook and stir 2 minutes longer. Remove from heat.
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4
In a small bowl, whisk a small amount of hot mixture into egg yolks; return all to pan, whisking constantly. Bring to a gentle boil; cook and stir 2 minutes. Remove from heat. Gently stir in chopped coconut, butter and vanilla until butter is melted.
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5
For meringue, in a small bowl, beat egg whites with cream of tartar on medium speed until foamy. Gradually add sugar, 1 tablespoon at a time, beating on high after each addition until sugar is dissolved. Continue beating until soft glossy peaks form.
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6
Transfer hot filling to crust. Spread meringue evenly over filling, sealing to edge of crust. Sprinkle with flaked coconut. Bake 12-15 minutes or until the meringue is golden. Cool 1 hour on a wire rack. Refrigerate at least 3 hours before serving.