Fill a cocktail glass with ice and water then set to the side to chill. Add Johnnie Walker Black, Dark Creme de Cacao, and jalapeño to shaker tin. Fill tin 3/4 full with ice, cap the tin, then shake vigorously. Empty ice and water from cocktail glass then double-strain contents of tin into cocktail glass. Garnish rim with a slice of jalapeño (optional). Serve to guest/ pair with barbecue or smoked meat.