First of all, you need a shaved ice machine to make smoothies. Then, pour the condensed milk over the top of the smoothie. Sprinkle with red beans or red bean paste bought in the supermarket (there are also red bean pastes for noodles). Finally, some green tea. PS: Note that the green tea, condensed milk, and red bean paste must be cold, otherwise the smoothie will melt quickly. If you want to make red bean paste yourself, fill the pressure cooker with water, add red beans, and press for ten minutes.