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Cut butter into flour until mixture resembles coarse crumbs. Add sour cream and vanilla, mix well. Refrigerate for at least 2 hours.
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Heat pineapple and sugar over medium to medium high heat in saucepan until bubbling. Add cornstarch a tablespoon at a time, stirring well until dissolved into pineapple and sugar. Cook over medium heat stirring until mixture is thick. Takes about 5 minutes total. Chill.
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Roll out half of dough and place in bottom of an un greased jelly roll pan (10x14). I like to over lap the edge a little, then fold back over the top crust.
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Preheat oven to 325 degrees.
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Spread cooled pineapple mixture over dough, leaving a 1/2 inch border.
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Roll out remaining dough and place carefully over top of crust and filling. Crimp edges to seal. Cut slits in top crust to allow steam to escape.
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Beat egg in bowl, brush over top of pastry.
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Bake at 325 degrees for about 55 minutes on lower half of oven, until light golden brown. Remove from oven and let cool.
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Mix glaze and drizzle over top of pastry. When completely cooled, cut into squares.