Moist and sweet, this vegan peach upside down cake is scrumptious. Delicious caramelized peaches on a fresh lemon vegan sponge. A upside down cake can be a little tricky, you want to make sure, the fruits are cooked, the sugar caramelized and the sponge is baked. Before reversing the cake, it has to rest for about 10 minutes, so the caramel can set but is still soft enough so the fruits won’t stick to the bottom.