Heat oven to 350 degrees F. Line bottom of 3 (9in) round cake pans with wax paper
Microwave chocolate and water in large bowl on HIGH 1-1/2 -2 min. or until chocolate is almost melted, stirring halfway through heating time. Stir until chocolate is completely melted.
Mix flour, baking soda and salt; set aside
Beat butter and sugar in large bowl with electric mixer on medium speed until light and fluffy. Add egg yolks, 1 at a time, beating well after each addition. Stir in chocolate mixture and vanilla. Add flour mixture alternately with buttermilk, beating after each addition until smooth.
Beat egg whites in another large bowl with electric mixer on high speed until stiff peaks form. Gently stir into batter.
Pour into prepared pans.
Bake 30 min. on until cake springs back when lightly touched in center. Immediately run spatula between cakes and sides of pans.
Cool 15 mins. remove from pans. Remove wax paper. Cool completely on wire racks.
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