Tomato, Basil, and Feta Salad

6 roma (plum) tomatoes

diced

1 small cucumber - peeled

quartered lengthwise

and chopped

3 green onions

chopped

¼ cup fresh basil leaves

cut into thin strips

3 tablespoons olive oil

2 tablespoons balsamic vinegar

3 tablespoons crumbled feta cheese

salt and freshly ground black pepper to taste