You will need 6- 8ounce juice glasses or dessert glasses of your choice
If you have to bake the cake, be sure to do that first and have it cooled and sliced into 18 thin discs for the layers (3 for each glass)
For the custard place the sugar and the lemon juice in a heavy bottom 2 quart sauce pot (you will need a larger pot for this since cooking caramel can be dangerous and may bubble up when adding the liquids, so BE CAREFUL!)
Cook the sugar stirring gently to distribute the lemon juice throughout and then stop stirring once it starts to boil, place a lid over top to create steam and help any sugar crystals dissolve.
Remove the lid once you see there are no crystals left on the sides of the pot and let it boil rapidly~ don't walk away!
Once the caramel starts to turn amber, watch it closely as it can go from light amber to burnt in an instant!
Once the color changes to a medium amber, carefully add the vegan butter and the room temperature plant milk and stir gently with a wooden spoon to dissolve the caramel.
Add the cornstarch with the second measure of sugar and whisk smooth as it comes to back to a boil
Once the custard boils, remove from the heat and add the vanilla extract
Immediately pour the caramel custard into the prepared glasses layering with your desired ingredients!
Refrigerate to set