Shake, strain over ice and soda or sparkling wine, and, optionally, seasonal fruit and herbs (as an in-glass garnish). Garnish with a long thin strip of grapefruit peel tied as best you can manage into a tie—half windsor for extra credit. Serve with straw.
Mint tea syrup: make a 1:1 syrup of white sugar and regular strength Moroccan mint tea, and then steep a sprig's worth of mint leaves for 20 minutes and strain.
Sort of a Pimm's Cup crossed with a mint Arnold Palmer. Sip those last few drops of summer.