oyster sauce - 25 g or 2 tablespoons (for stir fry sauce)
water or shiitake mushroom soaking liquid - 25 g (for stir fry sauce)
soy sauce - 1 teaspoon (for stir fry sauce)
dark soy sauce - 1/4 teaspoon (optional for stir fry sauce, for color)
sugar - 1/2 teaspoon (for stir fry sauce, halved from vegetable recipe)
MSG - 1/8 teaspoon (optional for stir fry sauce)
white pepper - to taste (for stir fry sauce)
beef - 400 g (thinly sliced)
dried shiitake mushrooms - 4 (soaked, stems removed, and sliced)
scallions - 2 (white and green parts separated)
ginger - 1 inch (sliced)
peanut oil - as needed (for frying beef and stir frying)
starch - 1/4 teaspoon (mixed with equal amount of water for slurry)
shaing wine - 1 tablespoon (for stir frying)