1.5 parts Cantera Negra Reposado Tequila
.75 part Fresh lime juice
.75 part Simple syrup
.5 part Fresh grapefruit juice
.25 part Campari

Ice
Garnish: Grapefruit wedge

Combine all ingredients in a cocktail shaker with ice.
Shake vigorously.
Strain into rocks glass over fresh ice.
Garnish with a grapefruit wedge.