In a saucepan, heat the sugar, 1/2 cup water and half the jalapeno (use the other half for chile salt, below) over medium, stirring, until the sugar dissolves. Off heat, let steep 5 minutes. Strain, discarding the jalapeno; let cool. In a pitcher, stir the jalapeno syrup, tequila, orange liqueur and lime juice.
Make 2 drinks at a time: Blend 1 cup Mangorita mix, 2 cups mango and 1 1/2 cups ice. Serve in glasses rimmed with chile salt. Repeat!