Bring 100 g of cream to 80 C and add the bloomed gelatine. Add the rest of the cream to the gelatine mix. Whisk in the coconut puree, break egg whites and whisk into mix.
Fill up a syphon and use two charges to foam into rings, cover with cling wrap and freeze.
Meanwhile, prepare the rhubarb by cutting it into pieces 7 cm long. Put in a bowl with 150 g sugar and juice of a lemon. Let sit at room temperature for an hour and then add 200 ml water.
Cook on a medium heat until rhubarb is soft.
Place rhubarb on a plate and sit the semifreddo on top. Pour rhubarb juice onto plate and serve with a scoop and lemon sorbet, garnished with a little mint.
