INGREDIENTS
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280 grams (2 cups) kumquat's all-purpose flour or other gluten-free flour
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1/2 cup sugar
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2 teaspoons baking powder
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1/2 teaspoon baking soda
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1/4 teaspoon salt
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1 cup fresh blueberries
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1 tablespoon grated lemon rind
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3/4 cup buttermilk
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1/4 cup melted butter
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1 teaspoon vanilla extract
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1 teaspoon fresh lemon juice
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1 large egg
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1 cup powdered sugar
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1 1/2 teaspoons lemon juice