01 - Place the chopped dark chocolate in a heatproof bowl.
02 - Warm the heavy cream in a small saucepan over medium heat until it just begins to simmer without boiling.
03 - Pour the hot cream over the chocolate. Let sit for 2 minutes, then add butter, vanilla extract, and salt.
04 - Stir gently with a spatula until the mixture is smooth and glossy.
05 - Cover the bowl with plastic wrap and refrigerate for 1 to 2 hours, until firm enough to scoop.
06 - Spoon or use a melon baller to scoop the ganache and roll into 1-inch balls by hand.
07 - Roll each truffle in sifted cocoa powder or your choice of coating.
08 - Arrange truffles on a parchment-lined tray and chill for 15 minutes before serving.