1pound (454 grams ) small shiitake mushrooms, cleaned and stems cut off
Heat the olive oil in a medium skillet over medium heat.
Add in the mushrooms and cook for 4-5 minutes, stirring and turning occasionally, until the mushrooms are golden brown.
Add the water to the skillet and cook, stirring the mushrooms occasionally, until the water has evaporated and the mushrooms are softened and have reduced in size. If needed, fry for another 2-3 minutes to achieve this.
If desired, stir in the oyster sauce and quickly stir it around to coat the mushrooms.
If you are cooking for pho or another dish, you can skip the sauce and simply garnish with green onions. We used these without the sauce in our pho.
If you have larger mushrooms, you should remove the entire stem as they are woody. I find that as long as I remove most of the stem on the smaller ones, the remaining part is soft enough to eat after cooking.