Wash and soak dried Chinese shiitake mushrooms for 2-5 hours until its soft
Plug in and turn on instant pot. Then, press sauté button, add 1 teaspoon of vegetable oil, ginger and garlic. After that, stir fried little bit.
Then, add the soaked mushrooms. (Remember to squeeze the mushrooms to remove excess water) Next, add oyster sauce, salt, sugar, water and mix it little bit. After that, cover the lid, close the vent, push manual button to adjust 20 minutes (at high pressure), and natural release.
While waiting the mushrooms almost done, boil water in a pot. Then, add some salt and vegetable oil (1 teaspoon). Until the water is boiling, immerse lettuce into the boiling water for few seconds and remove them quickly. (Remember don’t over cook lettuce)
After, put cooked lettuce on a plate.
When the braised mushrooms are ready, pour the mushrooms over the lettuce and serve.