Grapefruit Margaritas

Yields 4 servings

Juice from 2 large grapefruits (about 1 3/4 to 2 cups), freshly squeezed
Juice from 4 limes (about 1/2 cup), freshly squeezed
6 ounces (180 ml) tequila
4 ounces (120 ml) triple sec
Ice
Granulated sugar, for glass rims (optional)

To sugar-coat the rims of glasses, place the granulated sugar in a bowl large enough to fit the top of a margarita glass. Dip the tops of the glasses into the fruit juice; this helps the sugar stick very well (much better than water). Dip the tops of the glasses into the granulated sugar and tap the glass to remove any large chunks. Set aside.

In a large blender, combine grapefruit juice, lime juice, tequila, and triple sec. Fill the blender with ice and blend until well combined. Divide the mixture evenly between the glasses and serve immediately.

If you find the margaritas a bit tart, add a teaspoon of granulated sugar to your glass to remedy it