INGREDIENTS
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1 (16.25 ounce) package white cake mix
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1 cup all-purpose flour
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1 cup white sugar
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1/2 teaspoon salt
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1-1/4 cups 7UP
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1 cup sour cream
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3 egg whites
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2 tablespoons vegetable oil
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1/2 lemon, juiced and zested
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1 teaspoon vanilla extract
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1 cup butter, softened
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1 teaspoon pure vanilla extract
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16 ounces powdered sugar
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1/2 cup strawberry preserves or jam (the thicker, the better)
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2 to 3 tablespoon heavy cream, as needed
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3/4 to 1 cup chopped fresh strawberries
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Additional fresh strawberries, for garnish