Whisk the sauce ingredients together and set aside.
Season the sliced flank steak with salt, garlic powder, black pepper, cayenne pepper and white pepper. Add about 1 teaspoon of the prepared sauce and toss to coat. Then toss the steak with 2 tablespoons cornstarch before cooking.
Heat the avocado oil in a skillet or wok over medium-high heat. Cook the steak in batches until browned, then remove it from the pan.
Add the shrimp and jarred garlic. Cook until the shrimp are just turning pink, then remove them add more oil if needed
Add the onions, bell peppers, and ginger. Stir-fry until crisp-tender, then Add the remaining sauce and Shaoxing cooking wine.
Return the steak and shrimp to the pan Toss until everything is coated and the sauce thickens.Serve hot over rice or noodles.