Line the bottom of a 9-in. springform pan with foil; grease foil and sides of pan with 2 teaspoons butter; set aside. Melt remaining butter. In a large bowl, beat butter and sugar. Add egg yolks, one at a time, beating well after each. Beat in the water, oil and vanilla; mix well. Combine flour and cocoa; gradually add to egg mixture. Stir in pecans.
In another large bowl, beat egg whites on medium speed until foamy. Add cream of tartar and salt; beat on high until stiff peaks form. Fold into chocolate mixture.
Pour into prepared pan. Bake at 350° for 45-50 minutes or until top begins to crack slightly and a toothpick comes out with moist crumbs. Cool on wire rack for 10 minutes. Carefully run a knife around the edge of the pan to loosen; cool 1 hour longer. Refrigerate over night.
To assemble, invert cake onto a waxed paper-lined baking sheet. Remove foil; set aside. In a heavy saucepan, heat chocolate and cream over very low heat until chocolate is melted (do not boil); stir until smooth, Remove from the heat. Cool if necessary until mixture reaches spreading consistency.
Slowly pour over cake, smoothing sides with a metal spatula to evenly coat. Chill until set. Carefully transfer cake to a flat serving plate. Top with Chocolate Bow. Refrigerate leftovers.
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