Roasted Vegetable Pita Sandwich

Ingredients (12)

• 2 small zucchini
• 2 red peppers
• 8 ounces baby portobello mushrooms
• 1 small onion
• 1 tablespoon olive oil
• 2 tablespoons balsamic vinegar
• 1/2 teaspoon salt
• 1/4 teaspoon black pepper
• 4 whole wheat pitas
• Lettuce
• 1/2 cup crumbled feta cheese
• Tzatziki Sauce