Stir hoisin sauce, orange juice, soy sauce and olive oil together in a large bowl. Add green beans, toss to coat, and season with salt and pepper. (Hoisin sauce is very salty, so be careful not to over-salt the green beans.).
Spread beans in an even layer on a baking sheet with sides and roast for 15 to 20 minutes, until they are soft and slightly shriveled.
Sprinkle beans with chives and toss gently. Transfer to a serving dish, drizzle with pan juices, and sprinkle with the sesame seeds.