To make hibiscus tea, combine hibiscus flowers with water in a pot and bring to a boil. Remove from heat. Add 1/4 cup sugar, stir to dissolve and let sit to cool. Then strain flowers from the tea. Chill if not using immediately.

Make Mexican Cosmopolitan.  In a pitcher, combine tequila, orange liqueur, lime juice, hibiscus tea and sugar and stir until the sugar is dissolved.

For individual drinks, place 2 cups of ice cubes in a martini shaker.  Add enough Mexican Cosmopolitan liquid from the pitcher to bring up to the level of the ice.  Cover, then shake, rattle and roll.

Strain the icy liquid into martini glasses and serve.