Preheat oven to 350°F (175°C). Grease a 12-cup muffin pan. Dust each cup with flour and tap out any excess.
In a medium bowl, whisk together the flour, almond flour, lemon zest, and salt. Set aside.
Place the butter in a large bowl and beat with an electric mixer on medium until smooth. Add the Redpath® Granulated Sugar and beat until pale and fluffy, about 4 minutes.
Add the eggs one at a time, beating each in until fully incorporated before adding the next. Beat in the vanilla.
Reduce speed to low and add the dry ingredients, mixing only until flour is no longer visible.
Divide batter evenly between the prepared muffin cups (cups will be about half full).
Bake until cake springs back when gently pressed and a skewer inserted in the centre emerges clean, 20 to 22 minutes.
Allow cakes to cool in the tin for five minutes, then remove and transfer to a rack to cool completely before icing.