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1
Preheat oven to 350 F. Spray two 9x5-inch loaf pans with nonstick cooking spray.
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2
To make the cakes: In a medium bowl, whisk both flours, the baking powder, baking soda and salt together. Add the sugar, eggs, lemon zest and lemon juice to the bowl of your food processor. Pulse until well combined. With the machine running, slowly pour the butter through the feed tube until incorporated. Add the sour cream and vanilla and pulse until combined. Transfer the batter to a large bowl. Add the flour mixture in 3 additions, folding gently to incorporate after each addition. Mix only until just combined.
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3
Divide the batter evenly between the two prepared pans. Bake for 20 minutes, then rotate the pans and reduce the oven temperature to 325 F. Continue baking for an additional 30-35 minutes, or until a toothpick inserted in the center comes out clean. Transfer the pans to a wire rack and let the loaves cool for 15 minutes.
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4
To make the lemon syrup: While the loaves are cooling, combine the lemon juice and sugar in a small saucepan. Set over medium heat and cook until the sugar is completely dissolved, then continue cooking for an additional 3 minutes. Remove the pan from the heat.
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5
Turn the loaves out of the pans and set on a sheet pan lined with parchment paper. Using a toothpick, poke holes in the tops and sides of the loaves. Brush the loaves all over with the lemon syrup. Let it soak in, then brush again until you've used all of the syrup. Cool the loaves completely. (You can wrap the loaves and freeze them (for up to 6 weeks) at this point.)
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6
To make the lemon glaze: Whisk the confectioners' sugar and lemon juice together in a small bowl, until smooth and pourable. Pour the glaze over the top of each loaf, allowing it to drip down the sides. Let the glaze set for about 15 minutes before serving.
