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Heat oven to 350 F.
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Grease a foil lined 2 1/2" to 3" by 15" loaf pan (long and thin).
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Cream together the margarine and sugar till smooth.
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Add vanilla and eggs.
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Now add milk and flour a little at a time then add in baking soda.
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Mix well, will be a slightly stiff mixture.
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Now put 1/2 of the mixture in your loaf pan.
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In the remaining mixture add 1/4 cup of cocoa, 3T. sugar and 3 T. milk
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Mix well
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Now put this chocolate mixture on top of the vanilla mixture and swirl a spatula thru it to marble
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Bake for 1 hour and 10 minutes.
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Just before cake is done mix the lemon juice, water and powdered sugar together to make a thin icing.
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When cake is done remove foil and cake from pan, leaving foil under the cake.
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Now while the cake is still warm drizzle the icing over the cake.
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Enjoy