Preheat oven to 350°F (175°C). Grease or line a 9x13 baking pan.
In a large bowl, whisk together wet ingredients: eggs, oil, lemon juice, vanilla, and sourdough discard until smooth.
Add dry ingredients (flour, sugar, baking soda, baking powder, salt, lemon zest). Stir until just combined – don’t overmix.
Pour into prepared pan. Optionally sprinkle the top with a little lemon sugar or coarse sugar.
Bake for 30–35 minutes, or until a toothpick comes out clean.
Cool before icing – if you can wait! 😉
Instructions
Icing (Optional but Recommended)
Mix until pourable and drizzle over the cooled cake.