Mediterranean Lamb Wraps

Ingredients

• 1 cup unpeeled cubed cucumber (about 1/2)
• 1/2 cup reduced-fat sour cream
• 2 teaspoons red wine vinegar
• 1/3 cup (1.3-ounces) crumbled feta cheese
• 1/4 teaspoon freshly ground black pepper
• 1/8 teaspoon dried mint flakes
• Cooking spray
• 1 pound lean boneless leg of lamb, cut into 1/4-inch slices
• 1 onion, cut into quarters and thinly sliced
• 1 teaspoon Greek seasoning
• 4 (8-inch) flour tortillas
• 1 large tomato, thinly sliced
• 1 cup packed baby spinach leaves