Ingredients:
1 1/2 ounce brandy
1 1/2 ounce orange liqueur
1 1/2 ounce tequila
1 lime, juiced
1 slice lime

Method - The Procedure
Pour the brandy, liqueur, and tequila into a large glass and add ice. Rim a margarita glass with lime juice and salt, fill with ice and garnish with a lime slice. Carefully pour the contents of the large glass into the salted margarita glass, leaving the salt undisturbed.

This recipe from CDKitchen for Presidential Margarita serves/makes 1