Grapefruit Swizzle

A while back my brother-in-law gave us some Jamaican overproof rum and I’ve been trying to decide what to do with it ever since. Overproof rum isn’t something I normally buy, and I couldn’t find a lot of drinks that called for it. This past weekend I was moved by the spirit of the islands and the ridiculously hot weather to make a grapefruit swizzle. Most rum swizzle recipes are made with a combination of fruit juices including orange, pineapple, and lime, but I decided to keep it pretty simple and just use fresh grapefruit juices, with a touch of grenadine for added sweetness. Traditionally, a woody stem is used to mix a swizzle, but as I didn't have any woody stems handy, I used a long bar spoon instead.