Cream together butter, sugar, beaten eggs, vanilla, and lemon. Sift together flour, baking powder, and salt. Add flour mixture, alternately with milk, beginning and ending with flour mixture. Fold in floured black walnuts. Batter will be thick. Bake in a greased and floured tube pan at 350 degrees for 1 to 1 1/2 hours. Avoid opening oven for first hour. Top should spring back and cake tester should come out clean. Top usually cracks.
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