1. First put the digestive biscuits in a bag, and then use a rolling pin to grind the digestive biscuits into powder
2. Use a whisk to beat the whipped cream to seven minutes
3. Add condensed milk to the whipped cream and continue to whip until thick and bag it.
4. Spread biscuit powder on the bottom of the sawdust cup and flatten it
5. Squeeze in another layer of cream and flatten
6. Repeat this until the cup is almost full, and finally put a layer of biscuit powder and use cream to draw a smiley face
7. Put it in the refrigerator and freeze for three hours
