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The name's not very descriptive in itself, but it's basically a limey sugary rum - they used to make it to help stretch their rum rations out a bit. Lime juice probably helped reduce the risk of scurvy too. This isn't the same as "Navy Grog" which is a cocktail invented in the 1940s, and contains 3 different rums, 2 differnt juices, soda water and honey syrup.