Made with gin and tonic water poured over ice, then garnished with a lime wheel is called Gin and Tonic. In the early 19th century, the cocktail was introduced to India by British officers. Malaria was a persistent problem in India, so the officers used the cocktail to prevent and treat the disease with the tonic's quinine. Due to its bitterness and sour notes, this cocktail is hugely popular worldwide, especially during the summer months.