Step 1

In the container of a cocktail shaker, add the silver tequila, freshly squeezed lemon juice, freshly squeezed lime juice, light agave liquid sweetener, liquid egg whites, and bitters.

Step 2

Add the lid and shake vigorously for 15 to 20 seconds. Be very careful to hold a tight grip on the shaker lid, as the expanding egg whites may want to pop the lid off.

Step 3

Remove the lid and add ½ cup of ice to the cocktail shaker and shake for an additional 15 to 20 seconds. You want a lot of froth in your cocktail shaker.

Step 4

Pour the tequila sour, while straining out the ice in the shaker, slowly into a short 10-ounce cocktail glass (these are often called old-fashioned glasses or lowball glasses).

Step 5

You can add an optional garnish of thinly sliced lime on the rim of the glass.