This tequila cocktail from celebrity event planner Colin Cowie can be batched in advance when entertaining, allowing you to simply shake, pour, and garnish on the day of the party.
Place tequila, pear puree, lime juice, and agave in a cocktail shaker; fill with ice. Cover and shake to combine. Strain into a martini glass and spray with mezcal. Garnish with tarragon and serve.