Peel the sweet potatoes and cut into equal pieces.
Heat the butter in the pressure cooker. Add the sweet potato, cinnamon sticks, cardamom, star anise and baking soda.
Boil under high pressure for 20 minutes.
Let cool and remove the spices.
Smooth the mass in the blender and cool.
Save 150 grams for the parfait.
Spread the remaining puree thinly on a baking mat and dry at 50 ˚C until crispy.
Beat the parfait in the mixer and add the sweet potato puree.
Transfer to a piping bag, pipe the mass into the molds and freeze.
For the chips, peel the sweet potato and slice thinly on the mandolin.
Deep-fry at 170 ˚C in sunflower oil, but do not let it color.
Dry with paper towels and sprinkle lightly with icing sugar.
Dry at 50 ˚C until crisp.
For the caramel, boil the carrot juice together with the mandarin juice until it caramelizes and add the butter.
Store in a squeeze bottle.
Blanch the basil and cool in ice water.
Pat dry well and chop finely in the blender with the oil.
Pass through a fine sieve and store in a squeeze bottle.