Add the fresh orange juice, lime juice, and sugar into a blender. 

Add ice and blend until slushy on the crushed ice setting. Pour into a serving pitcher. 

Add salt to a flat dish. Rub a cut lime or lemon around the rim of each glass. Place the rim of each glass into the salt and swirl it to cover the rim. 

Stand the glass up again and pour in the margaritas. Serve immediately and enjoy!

Note: If you are serving children, you may want to omit the salt rim from their glasses, as it is more of an adult taste.

Variation: Substitute 1 cup fresh pink grapefruit juice and 1/3 cup fresh tangerine juice for the orange juice and lime juice. Fantastico!