Hot Cocoa Mix, Marshmallow Sweet marshmallows mixed with rich, velvety cocoa. Made with ethically sourced cocoa. Add hot milk and stir. Treat your inner child to a mug of creamy hot cocoa, topped with delightfully gooey marshmallows. Starbucks is committed to purchasing cocoa that's grown and traded in an ethical and transparent way. Find out more at: starbucks.com/responsibility/sourcing/cocoa. Marshmallow roasts because all the rage in the 1890s.