1.5 oz. hot pepper vodka (*)
hot sauce (I used Cholula, but Tabasco or any other hot sauce is fine)
1 tsp. horseradish
ground black pepper
celery salt (or regular salt, or omit)
Shake with ice and serve on the rocks in a highball glass. Garnish with celery stalk. And lemon, lime, and/or olive, if you so desire.
(*) I make my own hot pepper infused vodka by adding jalapeños and a few dried habanero peppers to vodka and letting it infuse for a week or so. You could also use a prepared pepper vodka like Absolut pepar.