In a large bowl, combine the first four ingredients; set aside. In a large bowl, beat the eggs, sugar, vanilla and orange zest until blended. Combine flour and salt; gradually add to sugar mixture until well combined. Stir in walnuts and the reserved fruit mixture.
Spread into a greased 15x10x1-in. baking pan. Bake at 350° for 30-35 minutes or until a toothpick inserted in the center comes out clean. Cool in pan on a wire rack. Cut into bars.
Editor's Note: Baked bars may be frozen in an air-tight container for up to 3 months.