Prepare your glass by running a slice of lemon along the rim and then dipping into a combination of salt and chilli flakes. Fill the glass with ice.
To make the cocktail, add tequila, orange liqueur, lemon juice, pineapple juice and chilli flakes to a cocktail shaker. Add ice and shake to chill, about 15 seconds.
Strain into prepared glass. Top with dehydrated pineapple slice to serve.