Set your oven to preheat at 350°F (175°C) and grease a 9-inch round or square baking pan, lining it with parchment paper.
In a large bowl, whisk together almond milk, lemon juice, melted coconut oil, vanilla extract, and lemon zest. Allow the mixture to sit for a couple of minutes so it curdles slightly.
In a separate bowl, sift together the flour, baking powder, baking soda, sugar, and a pinch of salt. Gradually fold the dry ingredients into the wet mixture, stirring gently until they are just incorporated. Take care not to overmix, as this will help keep the cake light and airy.
Pour the batter into the prepared pan, spreading it out evenly. Gently tap the pan on the counter to release any air bubbles.
Bake for 30-35 minutes, or until a toothpick inserted into the center comes out clean.
After baking, allow the cake to cool in the pan for 10-15 minutes before carefully transferring it to a cooling rack.