Step 1

Pre-heat oven to 350F (175C). Grease and line a 9×5 inch loaf pan with parchment paper

Step 2

In a large bowl, combine sugar and lemon zest together, then use your fingers to rub the sugar and zest until sugar is moist and fragrant

Step 3

Add eggs in and whisk until pale and frothy

Step 4

Add yogurt and vanilla vanilla extract and mix well

Step 5

Sift in gluten-free all-purpose flour, xanthan gum (if using) baking powder and salt and then whisk well until combined

Step 6

Use a spatula to fold in the melted butter into the batter until batter is glossy

Step 7

Pour batter into prepared loaf pan and bake for 40 to 50 minutes, or until a toothpick inserted in the middle comes out clean

Step 8

Allow cake to cool before removing from pan and slicing