Sauce: Mix together all Sauce ingredients then set aside.
BBQ Pulled "Pork": Preheat oven to 400°F (204°C). Using two forks, shred the stems and caps roughly into pieces. Set on a parchment paper-lined baking sheet. Drizzle with oil, paprika, salt, cayenne, and garlic. Toss around to evenly coat the mushrooms, then bake for 20 minutes, or until mushrooms are a bit crispy and brown on the edges. In a bowl stir together cooked mushrooms and BBQ sauce. When finished, increase oven heat to 450°F (230°C) for the pizza.
Dough: Grease a large pan (circular or rectangular) well, optionally dusting it with cornmeal. Roll pizza dough out into a large circle or rectangle (depending on the shape of your pan), then transfer dough to the pan.
Assemble: Spread your sauce evenly onto the pizza, leaving about ½ inch free around the outside. Sprinkle on 1 cup of the cheese, then top with BBQ pulled "pork", kimchi, red onion, and scallions. Sprinkle on remaining cheese. Bake for 10 to 15 minutes, or until cheese is melted and golden brown in spots.
Serve: Slice and serve warm, topped with Kimchi Mayo, fresh cilantro, and crushed red pepper flakes!
Notes
King oyster mushrooms can be found in most Asian supermarkets! You can substitute oyster mushrooms if needed (use about 3 heaping cups).