Apart from ginger, thyme, and licorice root, honey, mint, pepper, and lemon also form part of some remedies to get rid of cough. Watermelon, elderberry, button mushrooms, yogurt, spinach, sweet potato, broccoli, and garlic are also known to improve the immune system. https://www.noor-lifestyle.com/2017/02/simple-yet-effective-remedies-to-get.html