For the crust:
Wash the mushroom with a paper towel (it soaks a lot of water so it’s best not to put it directly under a stream of water) and rub it in a small amount of ume plum vinegar (just a few drops, it’s very strong), letting it soak in for about 30 minutes.
For the marinara sauce: Blend all ingredients until very smooth. Add water from the soaking liquid of the sundried tomatoes only if necessary for blending.
For the mushrooms:
Soak mushrooms in coconut aminos and spices for 30 minutes or more.
For the “cheese”: Blend all ingredients together in a high speed blender (you will need one for this recipe). You can use your tamper if necessary. You will probably have cheese leftover, which you can use in another recipe, or ferment overnight by placing in a bowl with 1 probiotic capsule mixed in.
To assemble:
Lay the mushrooms down on the flat side. Fill them with the marinara first, then some cheese, and then top with your favorite toppings!