In a small bowl, whisk the 4 tablespoon of Follow Your Heart vegan egg and 1 cup water until smooth and creamy. Set aside. If you're using JUST egg use ¾ of a cup without adding the water.
In a large sauce pan, whisk the 1 cup water, ¾ cup lemon juice, 1 cup sugar, vegan butter, 3 tablespoon cornstarch, and ¼ teaspoon salt together on medium heat. Keep whisking until the mixture comes to a low boil and is thick and creamy. It should look translucent.
Whisk in the 3 tablespoon vegan butter until it's melted and fully incorporated into the sugar mixture.
Add 1 cup of the lemon mixture to the vegan egg and whisk until combined. This prevents the egg from curdling.
Add the egg mixture to the pan of lemon mixture and whisk continuously until it just begins to boil and is thick and creamy.
Remove from the heat and whisk in the 2 tablespoon lemon zest.