Fill a large pot with water and add a tablespoon of salt. Bring pot to boil. Working in batches, immerse kale in boiling water until it turns bright green then quickly remove with strainer. Immerse greens in cold water to stop cooking. Remove greens and blot with towel to remove excess water and set aside. Toss greens with Cardamom Vinaigrette and marinate for at least half an hour. Heat 2 tablespoons olive oil in a saute’ pan over low-medium heat. Add onion and cook while stirring occasionally until golden brown. Remove onion from heat and set aside. Heat remaining olive oil in saute’ pan over medium-high heat. Add apples and cook while stirring frequently until slightly golden brown. Toss greens with onions and apples and serve.