A shaker is ideal for this cocktail,. Buy one. You’ll appreciate it. Or, find two plastic glasses in your house that fit into one another

-Muddle, or smash repeatedly, two good sized chunks, mouthfuls, of watermelon at the bottom of the shaker (Mixology 101 : most cocktails are around 6 ounces, the size of a martini glass. A straight martini is usually three ounces of booze with a wash of vermouth in the glass, but the shaking with ice makes those three ounces come out to around 4.5)

-Add two ounces of tequila, the juice of one lime, and a pinch of cayenne. Add a dozen ice cubes and SHAKE THAT SHIT. HARD.

Strain it into a glass. Or leave the ice. Enjoy.

I’ve thought of doing this with a juicer, but I like the chunkiness of the watermelon, something you can pick out with your fingers when you’re done.