Combine boiling water and cocoa, let cool. In large mixing bowl, beat egg whites and cream of tartar until stiff. Sift together flour, sugar, salt, and soda in a bowl. Make a well and add salad oil, egg yolks, cocoa mixture and vanilla, beat well. Fold into very stiff egg whites until mixture is all the same color. Bake in an ungreased tube pan at 325 degrees for 55 minutes.
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