2 1/4 cups whole milk
1/3 cup heavy cream
3/4 cup sugar, divided
1 cup unsweetened cocoa powder (recommended: Pernigotti)
2 ounces bittersweet chocolate, finely chopped
4 extra-large egg yolks
2 tablespoons Mexican coffee flavor liqueur (recommended: Kahlua)
2 teaspoons pure vanilla extract
Large pinch kosher salt
8 chocolates, roughly chopped, optional (recommended: Baci)