Chill four small bowls or glasses in the freezer for 10 minutes.
Brew the espresso so it’s hot and aromatic.
Scoop vanilla ice cream into the chilled bowls, about two scoops each.
Splash coffee liqueur over the ice cream, if using.
Pour hot espresso over each serving right before eating.
Top with whipped cream, chocolate shavings, nuts, and a tiny sprinkle of sea salt.
Serve immediately while the ice cream is just melting into the coffee.