This recipe shows you how to easily make a smooth, melt-in-your-mouth crushed coffee jelly using bottled coffee and powdered gelatin, both available at 100-yen shops, in just one plastic bottle. The process is simple: mix the coffee and gelatin in a heat-resistant container, heat it in the microwave, pour it back into the plastic bottle, and chill it in the refrigerator until firm. You can make jelly with two types of coffee—unsweetened and lightly sweetened—and top it with vanilla or chocolate cookie ice cream and chocolate syrup to create a visually appealing homemade café dessert. It's the perfect cool treat for the upcoming hot season.