Put ice cubes in a highball glass. Ice cubes should always be preferred to crushed ice, as crushed ice would dilute the cocktail far too quickly.
Pour the grenadine syrup into the highball glass over the ice cubes. This makes sure that the typical sunrise effect (red at the bottom and yellow at the top) is created later.
Mix the tequila, freshly squeezed orange juice and freshly squeezed lime juice in a shaker and then pour it through a strainer into the highball glass.
Stir briefly so that the ingredients can mix.
Serve with a slice of orange and a cocktail cherry on the rim of the glass.