Bloody Mary Mix: Pulse celery in a food processor until finely chopped. Add 2 cups tomato juice and puree until smooth. Transfer to a pitcher and stir in remaining 4 cups tomato juice, lemon juice, horseradish, Worcestershire, celery salt, hot sauce, and pepper. Cover and refrigerate at least 12 hours and up to 2 days.

Shooters: Stir together equal parts salt and pepper on a small plate. Rub lemon wedge around the rims of two double shot (3-ounce) glasses. Dip rims into salt and pepper mixture.

Pour 2 ounces Bloody Mary mix into bottom of each glass (reserve remaining Bloody Mary mix for another use). Holding a spoon upside down over the top of the glass, slowly pour 1 ounce vodka over spoon into each glass (vodka should sit on top of Bloody Mary mix and create a layer of black). Garnish with celery.