Duff's Black and White Cookie

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1 tablespoon dry yeast

1 cup milk

1/2 pound (2 sticks) unsalted butter, room temperature

1 3/4 cups sugar

1/2 teaspoon vanilla extract

1/4 teaspoon lemon extract

2 1/2 cups cake flour

2 1/2 cups all-purpose flour

1/2 teaspoon salt

Vegetable cooking spray (not flavored)

Ganache:

1 1/4 cups heavy cream

1 pound good dark chocolate, chopped

1 pound good white chocolate, chopped