Prepare the Beef: Slice the flank steak or sirloin into thin strips, approximately ¼-inch thick, making sure to cut against the grain to keep the meat tender. In a mixing bowl, combine the beef with 2 tablespoons of soy sauce, 1 tablespoon of Shaoxing wine, 1 teaspoon of cornstarch, and ½ teaspoon of baking soda (if using). Allow the beef to marinate for 10-15 minutes to absorb the flavors.
Preheat the Blackstone Griddle: Set your Blackstone griddle or a large skillet to high heat (around 450°F). Spread 1 tablespoon of vegetable oil over the cooking surface to prevent sticking.
Dry-Fry the Beef: Add the marinated beef to the griddle in a single layer. Let it cook undisturbed for about 2 minutes to develop a crispy crust. Afterward, stir-fry the beef for an additional 2-3 minutes, flipping occasionally until it is golden brown and slightly crispy. Once done, push the beef to one side of the griddle.
Stir-Fry the Aromatics: Add the remaining tablespoon of vegetable oil to the exposed side of the griddle. Toss in 2 teaspoons of Sichuan peppercorns and 8–10 dried red chilies, stirring for about 30 seconds until fragrant. Then add 1 tablespoon of fermented black beans, 3 minced cloves of garlic, and 1 tablespoon of julienned ginger. Stir-fry this mixture for an additional minute, allowing the flavors to meld.
Season and Finish: Mix the cooked beef back into the aromatic mixture on the griddle. Sprinkle with 1 teaspoon of sugar and drizzle 1 teaspoon of sesame oil over the top. Add the white parts of the sliced scallions and stir-fry everything together for about another minute to ensure even seasoning.
Serve Immediately: Turn off the heat and garnish the dish with the green parts of the scallions and 1 tablespoon of toasted sesame seeds. Serve hot alongside steamed white rice or Sichuan-style noodles.