Mango Margaritas

Zest the limes and lay the zest on a plate. If you have the time, let the zest dry out for ten minutes or so. Pour the coarse sugar over the zest and toss it around with your fingers to combine. Lime sugar! Yum. Throw the mango chunks into a blender. Pour in the tequila, triple sec, and sugar. Squeeze in the juice of the limes, then top off the whole thing with ice. Blend it until it's totally smooth. Give it a taste, then add more of what you think it needs (alcohol, sugar, lime, etc.) To serve, cut a small wedge in one of the juiced limes and rub the lime all over the rim of the glass to moisten. Dip the rim of the glasses in the lime sugar to give it a pretty, crystally rim. Pour in the margaritas and serve immediately!