Green Bean Salad

Bahan-bahan (6 porsi)

• 1½ pounds trimmed green beans, (cut into 2 or 3-inch pieces)
• 1 pint grape tomatoes, (halved)
• 1/2 medium red onion, (chopped (see Recipe Notes below))
• 6 ounces feta cheese, (crumbled or cut into chunks)
• 1/4 cup olive oil
• 3 tablespoons balsamic or red wine vinegar
• 1 medium garlic clove, (minced)
• 1 teaspoon herbs de provence
• 1 teaspoon Dijon mustard
• salt and pepper, (to taste)