You have a couple of options when it comes to making El Diablo. The first, which we recommend in this recipe, is to put all the ingredients into your cocktail shaker then strain into a glass. This will give your cocktail a reddish-purple hue, but if you want something a little more out there, you can turn El Diablo into a 'float' by adding the ingredients one by one into the glass. Start with your tequila, then add lime juice, ginger beer and the Creme de Cassis to finish. The taste should be more or less the same either way – this is about aesthetics only – so try making both before deciding which you prefer.
If you love the El Diablo, it may be worth checking out other cocktails making use of ginger beer as an ingredient. In the cocktail world, these are known as 'mules' – the most famous of which is the Moscow Mule. These simple cocktails use a base spirit, lime juice and ginger beer as the only ingredients, with the Moscow Mule featuring vodka, the Mexican Mule tequila, the Kentucky Mule bourbon, and the Mezcal Mule mezcal. As refreshing as they are easy to make, the Mule family is well worth getting to know if you love your ginger beer!