Pour 2 oz Grapefruit Rosemary mixer, 2 oz tequila (regular or NA--we like Free Spirits), and 1 oz Aperol (regular or NA--we like Wilfred's) in a cocktail shaker. Fill shaker with ice and shake for about 15 seconds, until chilled.
Strain into a glass over ice. Consider adding a splash of soda water to spritz it up.
Garnish: dried grapefruit // Glass: rocks