Grand Marnier gives these truffles a hint of orange flavor. Other liqueurs can be substituted.
Place chocolate in a bowl. Bring cream, Grand Marnier, and salt to a simmer in a small saucepan. Pour over chocolate, and let stand for 2 minutes. Whisk until smooth.
Pour chocolate mixture into an 8-inch square baking dish, and refrigerate until chilled, about 30 minutes.
Scoop balls of chocolate mixture using a tablespoon or a 1-inch ice cream scoop. Roll balls in cocoa powder, tossing, until fully coated. Shake off excess.