What is the Original Margarita recipe ?

The Margarita was originally created when Dallas socialite Margarita Sames mixed her two favourite spirits, Cointreau and tequila, together with lime juice while on vacation in Acapulco back in 1948. This original Margarita recipe has stood the test of over 75 years’ time. Thus the original Margarita recipe remains: 
30 ml Cointreau
50 ml blanco tequila
20 ml fresh lime juice

1. Make a salt rim on your glass
2. Combine all ingredients in a shaker with ice
3. Shake vigorously
4. Strain into a Margarita glass
5. Garnish with a lime wheel