"Very simple beginner-friendly vegetarian mushroom bao buns recipe for 4 people using a single pan with a removable steamer basket. The recipe must accurately reflect that the mushroom filling is cooked first in the pan, then removed and kept warm, then water is added to the same pan and the bao buns are steamed in the basket, then filled with the warm mushrooms. Use mixed mushrooms and an Asian-style sauce including hoisin sauce. Keep it as simple as possible, brand-friendly, and use metric units only."