Warm Greek Pita Sandwiches With Turkey and Cucumber-Yogurt Sauce

Ingredients

• ✓ ½ cup sour cream
• ✓ ½ cup plain low-fat yogurt
• ✓ ½ cup cucumber, peeled, grated and squeezed as dry as possible
• ✓ 2 teaspoons red or rice wine vinegar
• ✓ 2 garlic cloves, minced
• ✓ ½ teaspoon Salt and pepper, to taste
• ✓ 4 large pitas
• ✓ 2 tablespoons olive oil
• ✓ 1 large onion, peeled, halved and cut into chunky wedges
• ✓ 3 cups leftover roast turkey, pulled into bite-sized pieces
• ✓ 1 teaspoon oregano
• ✓ 1 ½ cups shredded lettuce (preferably romaine)
• ✓ 1 cup cherry tomatoes, halved and lightly salted