Begin by slicing your chosen beef into thin strips against the grain. This helps ensure tenderness. Season the beef with salt and pepper to taste.
In a mixing bowl, whisk together the cornstarch, Kosher salt, and black pepper. In a separate bowl, beat the eggs until frothy. Dip each beef strip into the egg, then coat it thoroughly in the cornstarch mixture, shaking off any excess.
In a large skillet or wok, heat enough peanut or vegetable oil over medium-high heat for frying. You want about ½ inch of oil in the pan. Make sure it’s hot enough by dropping a small piece of cornstarch into the oil; it should sizzle immediately.
Carefully add the coated beef strips in batches to the hot oil, making sure not to overcrowd the pan. Fry until golden and crispy, about 3-4 minutes per side. Remove the beef and place it on a baking sheet lined with paper towels to drain excess oil.
In a small bowl, whisk together the rice vinegar, light soy sauce, dark soy sauce, sugar, honey, sweet chili sauce, and red pepper flakes. Adjust the seasoning to your liking.
In the same skillet, add 1 tablespoon of peanut or vegetable oil. Add the sliced onion, carrot, garlic, and ginger. Stir-fry for about 2-3 minutes, or until the vegetables are just tender.
Once the vegetables are ready, return the crispy beef to the skillet. Pour the sauce over the beef and vegetables, tossing to coat everything evenly. Cook for an additional 1-2 minutes until the sauce thickens slightly.
Transfer the Crispy Chili Beef to a serving platter. Garnish with sliced scallions, toasted sesame seeds, and the red chili pepper for an extra pop of color and flavor.