Triple Chocolate Bread Pudding

Name: Triple Chocolate Bread Pudding
Ingredients: 3 cups heavy cream; 4 ounces bittersweet chocolate, chopped; 4 ounces milk chocolate, chopped; 1 cup sugar; 12 egg yolks; 2 tablespoons vanilla extract; Pinch of salt; 8 ounces white chocolate, chopped; 1/2 loaf challah bread, large diced; 1 cup cream; 1 cup chopped bittersweet chocolate; 4 tablespoons orange liqueur, such as Cointreau; Toasted Caramel Praline Sauce, recipe follows; 2 cups walnuts; 2 cups sugar; 1 cup heavy cream; 3 tablespoons unsalted butter