1) Fill a goblet or rocks glass with ice cubes. Add the tequila and a dash of Campari to give the drink a slight blush and balance the sweetness of the soda. Top off with the grapefruit soda. Skewer the fruit and stir into the cocktail. Drink.
2) Serve with a plate of wedged pineapple, a small bowl of your favorite chilli powder, and coarse salt, for dipping.