Green beans are a vegetable that most home cooks steam into submission and call it a day. Blistered green beans, by contrast, are a different species entirely: tender inside, charred and blackened on the outside, with a smoky depth that steamed beans can't approach. It's a thirty-second upgrade in technique that changes everything.
The trick is high heat and patience. Smoking oil in a wide skillet or wok, beans added in a single layer, then left completely alone for two or three minutes. Don't toss, don't poke, don't stir. You need the undersides to blacken and blister, and that only happens if the beans stay in contact with hot metal without any interruption. If your pan isn't big enough, work in two batches. Crowding kills this dish.
Once one side is blistered, toss and let the other side catch color for a minute or two more. They should still have a little bite. Overcooking past the blister point turns them mushy.
The sauce is built in the same pan after the beans are blistered. Minced garlic goes into the hot oil and turns golden in twenty seconds. Chili crisp, soy, a hit of oyster sauce for that deep umami glaze, sesame oil, and a little sugar. Toss the beans through this aggressively. You want every blistered surface to catch sauce, because the blackened skin has just enough porosity to hold it.
Fried shallots on top are the finishing move. They bring golden crunch against the dark beans and do half the visual work for you. A squeeze of lime at the table brightens everything. Flaky salt for the last crunch. It's a side that outshines most mains.