Preheat the oven to 180C or 356F.
Combine the almond meal, tapioca flour, eggs, cacao and zucchini in your food processor, scraping down the edges intermittently, until you have a nice smooth batter. Add the coconut sugar, maple syrup, almond butter, coconut oil, vanilla bean paste and sea salt, and continue to process until combined.
Add the baking powder and apple cider vinegar, and stir by hand to combine.
Pour the mixture into a small greased baking pan. I used both a small rectangular 27cm x17 cm and square 20cm x 20cm pan, both to success.
Place into the oven for 15-20 minutes. You may need to adjust the timings, depending on how thinly your cake batter is spread.
While the cake is cooking, process your avocado, cacao, maple syrup and sea salt together until a smooth icing forms. You might have to scrape down the blender a few times, depending on the size of your avo.
Once the cake has cooked and cooled, pile it up with the avo icing, and top with aesthetically pleasing bits and pieces as you see fit. The cake keeps well (icing and all) in the fridge for a number of days.