Place the finely chopped chocolate in a medium heatproof bowl.
Heat the heavy cream in a small saucepan over medium heat until small bubbles form around the edges.
Pour the hot cream over the chocolate and let stand untouched for 5 minutes.
Add the vanilla extract, Grand Marnier, and the salt, then stir slowly from the center outward until smooth and glossy.
Press the plastic wrap directly onto the ganache surface and refrigerate for 3-4 hours until firm.
Line a baking sheet with the parchment paper.
Scoop the chilled ganache into 1-inch balls using a small cookie scoop.
Quickly roll each portion between your palms to form smooth balls.
Roll each truffle in your choice of cocoa powder, chopped hazelnuts, or coconut until fully coated.
Place the finished truffles in an airtight container and store in the refrigerator.