Rinse the green beans in cold water and pat them very dry with a kitchen towel. Trim off the stem ends, leaving the tapered tips if you like. If any beans are extra long, snap them in half. Finely mince the garlic and set it aside in a small bowl so it’s ready to go once the pan is hot.
1 pound fresh green beans, 6-8 cloves garlic
Place a large wok or wide, heavy skillet (cast iron works well) over medium-high to high heat. Let it heat for 2–3 minutes until very hot; you should feel strong heat a few inches above the surface. Add the neutral oil and swirl to coat the bottom and a bit up the sides.
3-4 tablespoons neutral oil
Add the green beans in a single, mostly even layer; they should sizzle on contact. Let them cook undisturbed for 30–45 seconds to char slightly on one side. Then stir or toss every 30 seconds, cooking 5–7 minutes total, until the beans are bright green with some browned or blistered spots and starting to wrinkle but still firm. If the pan looks too dry, add a little more oil, but don’t flood the pan.
1 pound fresh green beans, 3-4 tablespoons neutral oil
Once the beans are nicely blistered, add 1–2 tablespoons of water to the pan and immediately cover with a lid. Let the beans steam for 1–2 minutes, then check for doneness: they should be tender-crisp, bending slightly but still snapping when bitten. If they are still too firm, steam for 1 more minute.
1 pound fresh green beans, 1-2 tablespoons water
Push the beans up the sides of the wok or over to one side of the skillet, leaving a bare spot in the center. Reduce the heat to medium. If the pan is very dry, add a tiny drizzle of oil. Add the minced garlic to the empty spot and cook, stirring constantly, for 30–45 seconds, just until very fragrant and barely turning golden; do not let it brown deeply.
1 pound fresh green beans, 6-8 cloves garlic
Stir the beans back into the garlic. Add the soy sauce, oyster sauce (if using), sugar, salt, and a few grinds of black pepper. Toss and stir for 30–60 seconds over medium-high heat so the sauce sizzles, reduces slightly, and coats the beans without pooling at the bottom. Taste a bean and adjust seasoning with more salt, pepper, or soy sauce as needed.
1 pound fresh green beans, 6-8 cloves garlic, 1 1/2 tablespoons soy sauce, 1 teaspoon oyster sauce, 1/2 teaspoon sugar, 1/4 teaspoon kosher salt, freshly ground black pepper
Turn off the heat. If desired, drizzle in the sesame oil and add a pinch of red pepper flakes or a few sliced chiles. Toss once more, then transfer the beans to a serving platter. Serve immediately while hot and glossy, as a side with rice, dumplings, or your favorite protein.
1 pound fresh green beans, 1/4 teaspoon sesame oil, red pepper flakes or sliced fresh chiles