Chocolate Pudding - Ice cream

1 each cake mix, chocolate package 1 package pudding mix, instant chocolate 2 cups sour cream 4 large eggs 1 cup water 3/4 cups vegetable oil 1 cup chocolate[...]

6 tablespoons unsalted butter 1 ounce unsweetened baking chocolate, chopped 1 egg yolk, from a large egg 1 cup all-purpose flour 1 1/4 cups granulated sugar[...]

1 (3 1/2 ounce) package chocolate pudding (cook-n-serve kind, not instant) 2 cups half-and-half cream or 2 cups milk 1 (12 ounce) package semi-sweet chocolate[...]