Chocolate Truffles

Name: Chocolate Truffles
Ingredients: Generous 2 cups (18 ounces; 500 grams) heavy cream; 21 ounces (600 grams) bittersweet chocolate, finely chopped; Generous 1/4 cup (2 ounces; 60 grams) Grand Marnier or Stoli Razberi vodka (optional); 18 ounces (500 grams) bittersweet chocolate, tempered; 18 ounces (500 grams) white chocolate, tempered; 2 cups (8 ounces; 230 grams) Dutch-processed unsweetened cocoa powder, sifted; 2 1/2 cups (9 ounces; 250 grams) shredded sweetened coconut, toasted (see note, below); About 2 cups (8 ounces; 230 grams) toasted nuts, finely chopped (see note, below)