Pineapple Bars

1/2 cup (1 stick) butter, softened
1/2 cup shortening
3/4 cups sugar
1 teaspoon vanilla
1/4 teaspoon salt
2 cups flour
1 can (1 lb. 4 oz.) crushed pineapple, undrained
2 tablespoons cornstarch
3/4 cup sugar
1 egg yolk
1/2 teaspoon salt
1 teaspoon lemon juice

Heat oven to 325 degrees F. Make crumb mixture by combining butter, shortening, sugar, vanilla, salt and flour. Press 2/3 of mixture into bottom of ungreased 8x12-inch baking pan. Drain a little juice from pineapple to blend with cornstarch. In medium saucepan combine remaining crushed pineapple and juice, sugar, egg yolk, salt, lemon juice and cornstarch mixture. Cook over medium heat, stirring until mixture thickens and is clear. Spread over crumb mixture in pan; sprinkle remaining crumbs over top. Bake for 50 to 60 minutes. Cut into 1x2-inch bars.