Mediterranean Beef Pitas with Yogurt-Cucumber Sauce

Ingredients

• 1-1/2 pounds Top Round Steak, cut 1 inch thick
• 1-1/2 cups nonfat plain Greek or regular yogurt
• 1 tablespoon fresh lemon juice
• 1 tablespoon minced garlic
• 1 medium cucumber
• Salt and pepper
• 6 white or whole wheat pita breads
• 3/4 cup plain or seasoned hummus
• 10 cherry tomatoes, quartered or 1 cup grape tomatoes, halved
• 1/3 cup halved Kalamata olives
• 3 tablespoons crumbled feta cheese