These beans make an easy side dish and can be served warm or room temperature.
FIRST In a small bowl whisk together lemon juice and zest, garlic, thyme, sugar, and olive oil. Season with salt and pepper, and set aside.
NEXT Fill a large stock pot half full of cold water. Bring water to boil, add green beans, and ½ tablespoon salt. Cook until beans are crisp-tender, about 5 minutes. Drain beans in strainer and run cold water over to cool.
LAST Place beans in a large bowl and toss with vinaigrette. Beans can be made a day ahead or serve immediately.