(Optional) If you want a salted rim place some lime juice on a tea saucer and place cup upside down, so you coat the rim. Dunk glass in salt and then carefully place ice in.
Place fresh squeezed orange juice, lemon juice and lime juice in a glass with ice.
Pour in tequila.
Top off with grapefruit juice and Fresca.
Garnish with lemon, lime and orange.