Ice cream ingredients: half a cup of sugar, one spoonful of cocoa powder, two spoonfuls of instant coffee, two cups of milk, one spoonful of corn starch, one spoonful of vanilla powder and one piece of chocolate. Tools to be prepared: egg beater and ice cream machine. Production method: 1. First, prepare a large basin of ice water for standby. 2. Half a cup of milk, pour in corn starch, and then stir until it is completely dissolved. 3. Pour the remaining milk into the pot, add cocoa powder and sugar, and heat over medium heat. During the heating process, keep stirring with an egg beater until it boils and add instant coffee. 4. Pour the mixture of milk and starch into the pot, mix with the mixture just boiled, continue to cook with medium heat, stir while cooking, and turn off the heat immediately after boiling. 5. Add vanilla powder and half chocolate. Be sure to keep stirring with an egg beater. 6. Put the pot into the prepared basin of ice water for cooling, and constantly stir the mixed liquid when cooling. 7. Finally, put the prepared ice cream in the refrigerator and freeze it for one night. The next day, according to the instructions of the ice cream machine, pour in ice cream liquid to make ice cream.