Greek Green Bean Salad

Name: Greek Green Bean Salad
Prep time: 30 min
Cook time: 5 min
Total time: 35 min
Cuisine: European, Mediterranean, Greek
Ingredients: 1 lb. fresh green beans; 1 small sweet white onion, cut in half crosswise, then into slivers the same size as the beans (see notes); 1/2 cup pitted Kalamata Olives, cut in half (see notes); 1 C crumbled Feta cheese; 3 T white balsamic vinegar (see notes); 2 T extra-virgin olive oil; 2 tsp. fresh lemon juice (see notes); 2 tsp. Dijon mustard; 1 tsp. dried oregano; 1 tsp. Greek seasoning; fresh-ground black pepper to taste