Copyright AFP 2017-2020. All rights reserved. A video shared thousands of times on Facebook claims that a tonic made of onions, ginger, garlic, lemon and hot water can cure Covid-19. This is false; health professionals, including those at the World Health Organization (WHO), have repeatedly refuted these claims. A video shared more than 4,000 times on Facebook and archived here shows a woman dressed in a nursing uniform claiming to have cured Covid-19 patients using a combination of onions, ginger, garlic, lemon and hot water. âThis is one COVID remedy,â reads the caption on the post, published on a page called Men and Women for Christ.