Preheat oven to 350°F (175°C).Line a standard 9×5-inch loaf pan with parchment paper.
Mix Wet Ingredients
In a medium bowl, whisk together soy milk and lemon juice. Let sit 5 minutes to curdle (this makes a quick “buttermilk”).Add lemon zest, yogurt, oil, and vanilla extract. Whisk until smooth.
Mix Dry Ingredients
In a large mixing bowl, sift together flour, caster sugar, baking powder, baking soda, and salt.
Combine
Pour wet mixture into dry mixture. Stir gently until just combined—don’t overmix. Batter should be slightly thick.
Bake
Transfer batter to loaf pan.Bake for 45–55 minutes, or until a toothpick inserted in the center comes out clean.
Cool
Let loaf cool in pan 10 minutes, then transfer to a wire rack. Cool completely before icing.
Make the Icing
In a small bowl, whisk icing sugar with 2–3 tbsp lemon juice until smooth and pourable.Drizzle over cooled loaf and sprinkle with lemon zest. Serve and enjoy!
Notes
Notes & Swaps
Make it Vegan: Swap the Greek yogurt for plain, unsweetened vegan yogurt (soy or coconut yogurt both work great).
Sugar Options: Caster sugar is just fine white sugar. Regular granulated sugar works too, though the texture will be slightly less delicate. For a fully vegan loaf, use organic sugar, since some conventional white sugar is processed with bone char.
Oil Choices: Olive oil adds a fruity flavor, while sunflower or vegetable oil will be more neutral. Both give a moist loaf.
Vanilla: About 1 teaspoon is plenty for balance without overpowering the lemon.
Yogurt: If you only have sweetened yogurt, reduce sugar slightly.
Storage: Store loaf in an airtight container at room temperature for 2–3 days, or in the fridge for up to 5 days. The icing will firm up after a few hours.
Freezing: Freeze unfrosted loaf (whole or sliced) for up to 2 months. Thaw at room temp and add icing fresh.
Zest Tip: For maximum lemon flavor, rub zest into the sugar before mixing—it releases the oils.
Note: Nutritional information is approximate values and can vary significantly depending on the specific brands of ingredients used. Disclaimer: This information is for general guidance only and should not be considered professional nutritional advice.