01 -
In a small bowl, mix the soy sauce, sesame oil, rice vinegar, sugar, and red pepper flakes if using. Add the cornstarch and whisk until completely dissolved with no lumps remaining. Set aside while you prep the vegetables.
02 -
Bring a pot of water to a rapid boil. Drop in the broccoli florets and let them cook for just 30 seconds - this quick blanching helps preserve their bright color and crunch. Immediately drain and rinse under cold water to stop the cooking process.
03 -
Heat a large wok or skillet over medium-high heat. Add the cooking oil and wait until it's shimmering hot. Add the mushroom slices in a single layer and let them cook undisturbed for 2 minutes. Season with a pinch of salt and pepper, then stir and continue cooking for another 3 minutes until they turn golden brown and release their moisture.
04 -
Push the mushrooms to one side of the pan. Add the minced garlic to the empty space and cook for 30 seconds until fragrant but not browned. Stir to combine with the mushrooms.
05 -
Add the blanched broccoli to the pan and give everything a quick stir. Pour the sauce mixture over the vegetables and cook for 2-3 minutes, tossing frequently, until the sauce thickens and coats everything with a glossy sheen. Taste and adjust seasoning if needed.