Prep the glass (optional): Run a bit of caramel sauce around the rim of a coupe or martini glass. Dip the rim in flaky sea salt. Drizzle a little extra caramel inside the glass for presentation.
Combine ingredients: Add vodka, coffee liqueur, espresso, salted caramel sauce, and simple syrup (if using) to a cocktail shaker.
Add ice and shake: Fill the shaker with ice and shake vigorously for 15-20 seconds until very cold and frothy.
Strain: Strain into your prepared glass.
Garnish: Float three espresso beans on top if desired (they traditionally represent health, wealth, and happiness).
Serve immediately — this one is best enjoyed fresh and cold.