- Prepare an 8" x 8" cake pan with pan spray & parchment paper so that there is excess parchment hanging over the sides for easy removal of the entire finished cake later. 
- Preheat the oven to 350°F 
- Prepare the cake batter by combining the vinegar with the plant milk  
- Add the vanilla extract & reserve 
- Combine the flour, baking soda, salt & sugar of your choice in a large mixing bowl & whisk or sift together 
- Add the thickened plant milk, applesauce & oil and whisk to develop the batter~ about 50 strokes. 
- Pour into your prepared pan & bake for about 18 minutes or until done. If you gently press the center it will spring back, or do the toothpick test for moist crumbs. 
- Cool the cake in the pan, then prepare the custard by combining the sugar with the cornstarch in a medium sauce pot then add the plant milk 
- Bring to a boil over medium high heat whisking constantly 
- Let it bubble for about 10 seconds then remove from the heat & add the vanilla extract 
- Pour the hot custard over the cake in the pan then refrigerate to set 
- Next combine the unsweetened chocolate, sugar substitute & plant milk in a medium sauce pot. Medium heat whisking constantly to dissolve the sugar & melt the chocoalte. It will come together to a silky homogeneous ganache 
- Spread this chocolate icing over the cold & fully set custard in the cake pan & refrigerate until everything is firmly set 
- Cut into 9 portions