Preheat oven to 425 degrees F (220 C). Prepare a large baking pan and line it with foil.
Wash and dry the mushrooms and then carefully use a fork to score deep grooves along the length of the stems on all sides (see the photos in the blog post above). The grooves will make it easier to pull the mushroom apart by hand. Pull them by hand until they’re mostly thin strips (see note).
Place the shredded mushrooms on the lined pan and drizzle 2 Tablespoons of the oil over them. Stir them well. Season with salt and pepper.
Bake the mushrooms at 425 F (220 C) for 15 minutes.
While the mushrooms are in the oven, combine all the ingredients for the sauce in a bowl. Stir until smooth. Adjust levels of sweetness and spiciness to taste, as needed.
Remove the pan of mushrooms from the oven. Increase the heat to 475 F (250 C). If the mushrooms are sticking to the foil a lot, add the remaining Tablespoon of oil and carefully scrape up any stuck bits.
Add about a third of the sauce to the mushrooms and stir well. Return the pan to the oven and bake at 475 F (250 C) until the mushrooms appear to be crisping up again, 5-7 minutes.
Again, remove the pan from the oven, stir in half of the remaining sauce, and roast until some pieces are crispy, but not dried out.
Serve immediately with the remaining sauce (see note).