Grilled Beef and Avocado Pitas

Name: Grilled Beef and Avocado Pitas
Ingredients: 12 ounces beef flank steak; ½ cup bottled light clear Italian salad dressing; ½ teaspoon finely shredded lime peel; ¼ cup lime juice; 2 tablespoons snipped fresh cilantro; ¼ cup finely chopped onion; ¼ teaspoon salt; ¼ teaspoon ground black pepper; 4 cups spring baby salad greens; 1 medium red sweet pepper, stemmed, seeded and cut into bite-size strips; 1 medium avocado, halved, seeded, peeled and thinly sliced; 3 whole wheat pita bread rounds, cut in half horizontally