Sadly, summer has come to an end, and work has picked up accordingly. But, thankfully, summer produce is still in season, and the farmers' markets are going strong. Between heirloom tomatoes and sweet corn, I've been consuming as much watermelon as possible. Naturally, when I have excess, the most reasonable thing to do is to puree it and add it to liquor.
To puree, slice into 1 inch cubes (or so) and puree in a food processor or blender. If you want to avoid all possible chunks, you can then go through the puree with an immersion blender, but this is unnecessary unless you are very picky and/or must drink through a straw.
Once you have the puree, squeeze some lemons and / or limes into glasses with lots of ice. Leftover puree will keep for several days in the fridge.
Add gin to the glasses, about 2 oz. each. If you don't have gin (or don't like it), you can substitute basically any clear liquor — vodka or tequila are also delicious in this cocktail.
Fill glasses with puree. For a little fizz, you can top with soda water or lemon lime soda (such as Sprite). Top with extra citrus, if you want, stir well, and enjoy the last few days of warm weather and watermelon season.