1. Use knife to open each pita half into pocket. Set aside. In small bowl stir together yogurt, mint, 1 teaspoon of the oil and salt. Stir in cucumber. Cover and refrigerate until needed.
2. Cut MORNINGSTAR FARMS Mediterranean Chickpea Burgers into 1/2-inch pieces. Set aside.
3. In large nonstick skillet cook onion and garlic in the remaining 1 teaspoon oil over medium-high heat about 3 minutes or until tender. Stir in marjoram, rosemary and pepper. Add burger pieces and lemon juice. Cook and gently stir over medium-high for 2 to 4 minutes or until heated through.
4. Place 1 to 2 tomato slices in each pita pocket, if desired. Spoon burger mixture into pockets. Top with feta cheese. Serve immediately with yogurt mixture as dipping sauce.