Peel the sweet potatoes and slice them into smaller pieces.
Transfer them to a saucepan and add enough water to fully cover them.
Turn on the heat at maximum power and let them cook for 25 minutes once they start to boil.
Next, transfer these cooked potatoes to a food processor or blender, add the sugar and process well until combined.
Now, in a saucepan, add the 4 tablespoons of granulated sugar and stir until a caramel sauce forms.
Add all the processed potatoes and stir until fully incorporated into the caramel sauce.
Finally, hydrate the packs of unflavored jelly powder and transfer to the saucepan.
Stir well.
Transfer all this mixture to a rectangle silicone mold greased with vegetable oil.
Take it to the fridge and let it chill for at least 4 hours.
Unmold and serve.