Sweet and Sour Mix
3 cups water
3 cups sugar
2 cups lime juice
2 cups lemon juice
Combine water and sugar in a stock pot and stir to dissolve sugar. Bring to a boil then remove from heat. You now have simple syrup. Allow the simple syrup to cool. Add lime and lemon juice. Refrigerate until cold.
I like my margaritas on the rocks with plenty of lime and no salt. Feel free to modify to fit your particular likes and dislikes. (Charlie always goes for the salt.) Here's a loose recipe.
Fill a low-ball glass with ice. Combine one part tequila and two parts sweet and sour mix. Top with a splash of orange liqueur (I like Patron Orange) and a slice of lime.