Greek Salad Pita Sandwiches

INGREDIENTS

• 3 tablespoons extra-virgin olive oil
• 1 tablespoon red wine vinegar
• 1/2 cup chopped radishes
• 2/3 cup chopped red onion
• 1 cup crumbled feta cheese (about 4 1/2 ounces)
• 4 8-inch-diameter whole wheat pita breads, halved
• 1/2 cup chopped fresh Italian parsley
• 1 cup chopped green bell pepper
• 1 1/4 cups chopped seeded plum or cherry tomatoes
• 1 cup diced seeded peeled cucumber