Mint-Truffle Ice Cream Terrine with Mint and Chocolate Sauces

Name: Mint-Truffle Ice Cream Terrine with Mint and Chocolate Sauces
Yield: Makes 12 Servings
Ingredients: 1 1/2 cups heavy whipping cream; 16 ounces bittersweet or semisweet chocolate, chopped; 2 teaspoons pure peppermint extract; Unsweetened cocoa powder; 5 cups (2 1/2 pints) vanilla ice cream, slightly softened; 3/4 cup sugar; 1/3 cup water; 2 cups (lightly packed) fresh mint leaves