1. Purple sweet potato peeled, sliced and steamed
2. Put the yogurt, powdered sugar and purple sweet potato into the food processor and make a purple sweet potato yogurt paste
3. Put the gelatine slices in cold water in advance to soften it, pour out the excess water, and leave the softened gelatine slices. Put the bowl containing the gelatine slices in hot water, turn the gelatine slices into water, and pour in Stir evenly in the purple potato yogurt paste
4. Whipped cream electric whisk to make lines
5. Stir the whipped cream without purple sweet potato
6. Pour the purple potato mousse paste into the mold and refrigerate overnight
7. Wipe it outside the mousse ring with a hot towel, then you can take off the mold and enjoy it
