01 - Combine whole milk, heavy cream, and sugar in a small saucepan over medium heat. Warm until steaming without reaching a boil.
02 - Remove the saucepan from heat and add the chopped dark chocolate. Let it sit for 1 minute before whisking gently until smooth and fully melted.
03 - Incorporate vanilla extract and a pinch of sea salt into the chocolate mixture, stirring until evenly combined.
04 - Distribute the hot chocolate evenly into shot glasses or small espresso cups and serve immediately. Optionally garnish with whipped cream, chocolate shavings, or a light dusting of cocoa powder.