Step 1

First make your watermelon juice - see below. This can be done ahead and refrigerated.

Step 2

Put some salt and a little chili on a small plate and mix. Rub the rim of a glass with a slice of lime then dip in the salt-chili mixture to form a salt rim.

Step 3

Put the jalepeno slices in a cocktail shaker and muddle a little to release a little juice. (No need to do this if you plan to shake a lot or want less spicy)

Step 4

Add the watermelon juice, tequila, tripe sec and lime juice along with a few pieces of ice. Shake a minute until well chilled.

Step 5

Pour into the prepared glass, add ice if you like to chill further, and serve.