Soak shiitake mushrooms in hot water for at least 20 minutes. Squeeze out the excess water. Leave the stems on or cut them off, whichever you prefer. Set aside.
Blanch the broccoli florets with hot salted boiling water for 1 minute. Drain and set aside.
Stir in oyster sauce, soy sauce, sugar and water. Bring the mixture to a boil, reduce heat, cover and let simmer for 5-7 minutes or until mushrooms are tender, adding more water as needed. Add broccoli and stir to combine. Sprinkle with sesame oil, if desired.
Recipe by Salu Salo Recipes at https://salu-salo.com/shiitake-mushroom-and-broccoli-in-oyster-sauce/