Add your lemon juice, lemon zest, vanilla, melted vegan butter and plant milk to a large bowl, mix well. Add sugar and mix very well until combined
In a separate bowl, mix together the flour, baking powder, baking soda and salt. Add flour mixture in increments to wet mixture, whisking together well in between, until well combined
Spray or oil a loaf pan and pour cake mixture into pan, tapping the pan on a flat surface to even the mixture out
Bake for 40-45 minutes or until a toothpick inserted into the middle of the cake comes out clean
While baking, gently heat up 2 tablespoons of lemon juice and stir in 2 tablespoons of cane sugar for your simple syrup. Allow to cool
Once cake is done, cool in the pan for 10 minutes, then place on a cooling rack. Poke tiny holes throughout the cake and pour in syrup mixture evenly. Allow the cake to fully cool
Mix together 3 tablespoons of lemon juice with the 1 1/2 cups of vegan powdered sugar until very smooth. Pour evenly over cake and allow to set for a few minutes. Enjoy!