Instructions: Prepare dough by combining 1 cup flour, 1/4 cup sugar, 1 1/2 teaspoons lemon zest and vanilla in a mixing bowl. Add 1 egg yolk and 1/4 cup butter. Work together quickly with a pastry blender or hands. Add 1 to 2 tablespoons ice water to bind dough, if necessary. Wrap dough in waxed paper and chill for 1 hour.

Preheat oven to 400 degrees.

Remove sides from a springform pan. Roll one third of the dough 1/8" thick and place onto bottom of pan. trim to fit. Bake for 12 - 15 minutes or until light golden brown. Cool. Place springform sides back onto the pan. Roll remaining dough out to 1/8" thickness and cut to fit sides of pan, pressing firmly to seal around base. Trim dough to come only 3/4 " up the sides.

Increase oven temperature to 550 degrees.

In a large mixing bowl cream together the cream cheese, sugar and flour until smooth. Add eggs and two additional yolks one at a time until blended. Add orange and lemon zest, vanilla and heavy cream and blend. Pour into prepared springform pan. Bake at 550 degrees for 10 - 12 minutes, reduce temperature to 200 degrees and bake for 1 hour. Cool to room temperature before serving.

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