"A light and fluffy upside down blueberry and lemon sponge cake. Make this for any brunch or tea occasions...."
INGREDIENTS
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4 tablespoons unsalted butter
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1/2 cup sugar
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2 teaspoons lemon zest
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1 tablespoon fresh lemon juice
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2 1/2 cups fresh blueberries
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1 1/2 cups all purpose flour
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1 1/2 teaspoon baking powder
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1/2 teaspoon salt
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1 stick (4oz) butter at room temperature
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1 cup sugar
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1 tablespoon lemon zest
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1 teaspoon vanilla extract
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1/2 teaspoon lemon oil
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2 large eggs