In a large shaker, add all ingredients.  Shake well over ice.  Add to salted margarita glasses and add a good helping of ice.  Garnish with various citrus wedges.  Makes two summer cocktails. 

Alternatively, add 2 oz of fresh-squeezed tangerine juice.  

The nice thing about this recipe is it can be made ahead in a pitcher.  Instead, use 1 cup of fresh-squeezed orange juice and 1 cup of fresh-squeezed grapefruit juice. Add 3 oz of fresh-squeezed lemon juice or tangerine juice.  Add 8 oz or 1 cup of tequila and 4 oz of triple sec.  Mix well and leave in the fridge until ready to pour.  Juice may settle if it sits too long, be sure to stir or mix well, before pouring over prepared glasses.