Chicken Burritos with Pineapple Salsa

Name: Chicken Burritos with Pineapple Salsa
Ingredients: 1 (3.5 to 4-pound) chicken; 1 medium yellow onion, 1 peeled; Kosher salt and fresh ground pepper; 1 (8-ounce) can pineapple chunks, drained and chopped; 1 small red onion, diced; 1 jalapeno pepper, seeded and chopped; 2 tablespoons chopped cilantro; 1 tablespoon chili powder; 2 tablespoons lime juice; 3 scallions, chopped; 8 flour tortillas (reserve 2 for round 2 recipe Tortilla Pizza and 2 for Tortilla Soup); 1 can red or black beans, drained and rinsed; 1 cup shredded jack cheese