In a medium skillet, heat 2 Tablespoons oil and half of the peppercorns over medium-low heat, stirring frequently, until aromatic, about 1 minute. Add 4 garlic, ½ Tablespoon sriracha, 1 inch ginger and 3 scallions and cook, stirring about 1 more minute. Remove from heat and set aside.
Adjust rack to as close as possible to broiler and pre-heat broiler to high. In a large bowl, toss 1 pound green beans with 1 Tablespoon oil and season with salt and pepper to taste.
Arrange in a single layer on a foil-lined baking sheet. Broil until beans are blistered and very lightly charred, 3-5 minutes. Return beans to bowl.
Pour half of peppercorn mixture into bowl with beans. Toss to coat. Plate beans and pour remaining peppercorn mixture over the top, sprinkling with extra salt and pepper, if desired.
Serve immediately. This dish can also be chilled and reheated easily up to a day later.
Sichuan mixture is also delicious made and stirred with brown rice, over cooked/grilled chicken, pork and steak. Toss with pretty much any vegetables of your choice. Incredibly flavorful yet simple.