Heat a large heavy skillet to medium high and cook the ground beef until browned and crumbly. Break up any lumps. Approx. 5 minutes.
Add the mushrooms and onion and continue cooking for about another 4 minutes, until the vegetables have softened.
Add the soy sauce, Siriracha, ginger, garlic and rice vinegar. Cook until most of the liquid has evaporated which will take anothr 1 minutes.
Remove from the heat and add in the sesame oil and season.
Divide the mixture between the 8 cabbage leaves. Top with the carrots, scallions, cilantro, sesame seed and red pepper flakes. Garnish with the peanuts and serve with Thai Chili Sauce on the side if preferred.