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Preheat the oven to 350°F.
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Mix the dry ingredients (flour, sugar, baking powder and salt) in a bowl with a whisk. Add the lemon zest at the end and whisk through.
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In a separate bowl, mix the wet ingredients (eggs, buttermilk, lemon juice, vegetable oil & lemon extract)
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Slowly add the wet ingredients to the dry, whisking as you add. Set aside.
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REPEAT the recipe so you have enough for 4 layers!
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Separate your batter into four bowls. Add food colouring, leaving one layer as is. I find it easier to do the darkest layer first, and then eyeball the middle two so that you get a nice gradient.
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Pour each bowl into its own greased 8 inch round baking pan, and bake in the oven for about 30 mins, or until a toothpick inserted in the centre comes out clean.
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Set aside to cool.