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Preheat your oven to 375 degrees. Lightly oil a mini loaf pan size, or an 8 inch cake pan, square round or a muffin pan.
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In a large bowl, whisk the sugar, zest, juice, vanilla, oil, eggs and buttermilk until well combined.
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In a separate bowl, mix the flour with baking powder and baking soda and salt.
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Using a rubber spatula, gently fold the dry ingredients into the lemon mixture and pour into your preferred pan.
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Bake (middle rack) for about 20-22 minutes until a toothpick inserted in the middle of the cake comes out clear or with just a few moist crumbs.
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Remove from the oven and allow to cool for 10 minutes before removing it from the pan. Glaze the cake while still warm.
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For the glaze: Whisk all ingredients in a small bowl until nice and smooth. Add a little more juice if you prefer a runny glaze or a little more confectioner sugar if you prefer a thicker glaze.