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1. Preheat oven to 350 degrees and line pans with cupcake liners.
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2. Sift cake mix into a separate bowl and set aside.
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3. In a large bowl combine eggs, oil, zest, lemon juice, vanilla, milk and sour cream until smooth.
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4. Stir in cake mix.
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5. Bake for 17-22 minutes or until an inserted knife comes out clean.
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6. Glaze: Combine all ingredients in a bowl (using a whisk or fork is easiest).
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7. Buttercream: Beat butter until smooth. Add enough powdered sugar to make the frosting stiff, then slowly add in blackberry puree 1 Tablespoon at a time until you reach your desired consistency.
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8. Spoon glaze over cooled cupcakes and let set.
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9. When glaze is firm, pipe frosting on top and finish with a fresh blackberry.