The key to this recipe’s success lies in the technique, specifically the high-heat “dry-frying” method for the beans. Follow these steps carefully for perfectly blistered, crisp-tender beans every time. Having all your ingredients prepped and ready (a “mise en place”) is crucial, as the cooking process is very fast.

1. Prepare the Green Beans: Begin by thoroughly washing the green beans under cold running water. Pat them completely dry with a clean kitchen towel or paper towels. This step is critical; any excess moisture will cause the beans to steam rather than blister and char in the hot oil. Once dry, trim the stem ends off of each bean. You can leave the tapered tail end on for a more rustic look.
2. Mix the Sauce: In a small bowl, whisk together the low-sodium soy sauce, chili garlic sauce, rice vinegar, and sugar. Combining the sauce ingredients beforehand ensures they are evenly distributed and allows you to add them to the hot wok all at once, preventing any single ingredient from burning. Set the sauce aside.
3. Blister the Green Beans: Place a large wok or a heavy-bottomed skillet over high heat. Let it get very hot—you should see faint wisps of smoke rising from the surface. Add the 1 tablespoon of high-smoke-point oil and swirl to coat the pan. Carefully add the prepared green beans. Spread them into a single layer as much as possible. Let them cook, undisturbed, for 2-3 minutes. This allows them to develop a beautiful char and blistering on one side. Then, use tongs or a spatula to toss the beans and continue to cook for another 5-7 minutes, tossing occasionally, until they are crisp-tender and wrinkled with charred spots all over. Once cooked, transfer the beans to a clean plate and set aside.
4. Cook the Aromatics and Beef: Return the same wok or skillet to medium-high heat. Add the lean ground beef to the hot pan. Use a wooden spoon or spatula to break the beef into small crumbles as it cooks. Continue cooking until the beef is browned and cooked through, about 4-5 minutes. If there is excess fat, you can carefully drain it from the pan.
5. Combine and Sizzle: Push the cooked beef to one side of the wok. Add the minced garlic and grated ginger to the empty side of the pan. Sauté for about 30-45 seconds until they become intensely fragrant. Be careful not to let them burn. Once aromatic, stir the garlic and ginger into the cooked beef.
6. Bring It All Together: Return the blistered green beans to the wok with the beef and aromatics. Give the prepared sauce a final quick stir and pour it all over the beans and beef. Stir-fry continuously, tossing everything together to coat it evenly in the glossy sauce. The sauce will bubble and thicken almost immediately. Continue cooking for 1-2 minutes until everything is heated through and well combined.
7. Finishing Touches: Remove the wok from the heat. Drizzle the toasted sesame oil over the top and give it one final toss. The residual heat will release its nutty fragrance. Serve immediately for the best texture and flavor.