Step 1: Prepare the Rice
Rinse the rice under cold water until the water runs mostly clear. Add the rice and 2 cups of water to a medium pot or rice cooker. Step 2: Cook the Rice
Cook according to package directions. Once cooked, let the rice rest covered for 10 minutes before fluffing gently with a fork. Step 3: Pull the Mushrooms
Trim the stems from the shiitake mushrooms. Using two forks or clean hands, pull the mushroom caps into thin, shredded strips. Step 4: Make the Sauce
In a small bowl, whisk together the soy sauce, mirin, rice vinegar, maple syrup, sesame oil, miso paste, sriracha (if using), water, and cornstarch until completely smooth. Step 5: Cook the Mushrooms
Add the pulled shiitake mushrooms to the skillet. Cook for 8–10 minutes, stirring occasionally, until the mushrooms soften and begin to brown around the edges.