Heat the beetroot juice together with the red fruits.
Leave to gently infuse for 20 minutes without overcooking the red fruit.
Pass through a fine sieve and leave to cool.
Finely grind the kudzu and put in a pan with the whipping cream and beetroot juice.
Warm over a low heat, and stir continuously with a spatula until you have a thick pulp-like mixture.
Pour the mixture into a tin and cover with cling film.
Store in the refrigerator.