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Preheat your oven to 350 degrees and grease 2 9 inch cake pans with non-stick cooking spray.
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Cream butter, shortening, and sugar until light and fluffy.
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Add eggs, one at a time, mixing throughly in between each addition.
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Mix in vanilla, lemon juice and zest.
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In a separate bowl combine flour, baking powder and salt and mix to combine.
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Add ⅓ of the flour to the butter/egg mixture, mixing on low.
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Mixing just enough to combine, add ⅓ of the buttermilk.
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Continue until all of the flour and buttermilk has been incorporated, again mixing until just combined (do not over mix!).
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Fold in blackberries.
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Evenly distribute cake batter into pans and bake for 25-30 minutes, or until a toothpick or cake tester inserted in the center comes out clean. Remove from oven and allow to cool slightly in cake pans for about 5 minutes, then cool completely on a wire rack.