Potato Salad with a Twist

INGREDIENTS:
1 pkg frozen French green beans
6 red skin new potatoes, quartered
2 plum tomatoes, seeded and diced

DRESSING
1/2 cup olive oil
1/2 cup minced onion
1/4 cup French Dijon mustard
1/4 cup mayonnaise
2 tsp red wine vinegar
1/2 tbs each dried oregano and thyme
Salt to-taste
freshly ground black pepper