In a mixing bowl, whisk together the flour, cold water, and baking powder until smooth.

Dip the oyster mushrooms into the tempura batter and carefully place them in the hot oil. Fry until golden brown.

In a small saucepan, combine honey, soy sauce, and sesame oil. Heat until warm and well combined.

Remove the fried mushrooms from the oil, drain on a plate, and drizzle with the honey glaze before serving.