Prepare Vinaigrette: Combine the olive oil, lime juice, cilantro, grated garlic, salt and pepper in a small capacity food processor bowl. Puree or pulse the ingredients together until well emulsified and the cilantro is finely chopped in texture.
Scrape down the sides of the bowl once or twice as needed. Set aside while you prepare the green beans. Stir just before using.
Prepare the Green Beans: In a mixing bowl, toss the trimmed green beans lightly with olive oil, roughly 1 tablespoon or so, and season with salt. Preheat an outdoor grill to high heat
Distribute the green beans over the hot grill, perpendicular to the grates or on top of the metal rack. Cook the beans for roughly 3 to 4 minutes, tossing with tongs every few minutes, until evenly charred and beginning to soften. Transfer to a large platter.
Spoon the cilantro lime vinaigrette over the charred green beans, tossing lightly if desired. Before serving, sprinkle the beans with flaky salt. Serve hot, at room temperature, or cold from the fridge