One of the greatest Sichuan dishes. This version is from the great Danny Bowien and his Mission Chinese Cookbook.
Base
Braise
In a bowl, combine the shiitake mushrooms, hot water, and soy sauce. Soak until the mushrooms are rehydrated and feel soft
Drain the mushrooms, but save the liquid they were rehydrated in
Chop the mushrooms into small chunks using a food processor, or do it by hand if you've got the time
Combine the mushroom liquid, doubanjiang, and tomato paste in a bowl. Whisk to combine, then add the chopped mushrooms. Save 1 & 3/4 cups of this base for the recipe, and freeze or refrigerate the rest (should have enough leftover for a second batch of mapo tofu)
In a Dutch oven or other large pot, heat the chili oil over medium heat, adding the garlic, black beans, and chili crisp, and cook until the garlic has softened a bit and the mixture becomes aromatic
Remove the aromatics from the pan as best you can and set them aside for now
Turn the heat up a bit and add the Impossible pork, cook until browned well, using a wooden spoon to break it up into small pieces
Once the pork is well-browned, deglaze with the bottle of beer, then add back in the aromatics, fish sauce, mushroom powder, ground Sichuan pepper, and the 1 & 3/4 cups of base you saved earlier. Braise for up to an hour
Add the tofu just before serving, and stir it in and allow to cook for another minute
Serve with steamed white rice and garnish with cilantro, scallions, and a bit of extra prickly ash oil if you so desire