Mississippi Mud Cake

Name: Mississippi Mud Cake
Cuisine: American, Southern
Ingredients: 4 large eggs; 2 sticks (1 c) unsalted butter, melted; 2 cups sugar; 1/2 cup unsweetened cocoa; 1 teaspoon vanilla extract; 1/8 teaspoon salt; 1 1/2 cups all-purpose flour; 1 cup coarsely chopped pecans; 1 (10.5-ounce) bag miniature marshmallows; 1 (16 oz) package powdered sugar (icing); 1 stick butter, softened (icing); 1/2 cup cocoa (icing); 1 teaspoon vanilla (icing); 1/3 cup boiling water (icing)