We are very excited with our microwave rocky road cake. It omits the need to use an ISI siphon. Because we challenged ourselves to create the cake without one, we were able to enhance the end result. The rocky road has small inclusions of walnuts and marshmallows, adding texture to the rich, fudgy cake. Take a look at our process and get the recipe over on Serious Eats. Ideas in Food: Great Recipes and Why They Work Maximum Flavor: Recipes That Will Change the Way You Cook.