First, make the cream mixture. Start by melting the butter in a water bath. Then leave it to cool. Next, melt the white chocolate in a water bath and leave to cool, like the butter.
Next, mix the butter and white chocolate and add the sour cream slowly to this mixture. Stir well. Add the vanillas, coconut flakes and grated lemon rind. Now beat the cream to snow, add it as well. Beat by hand, do not use a mixer.
Dip the biscuits in the milk, then in the liqueur. Smear the platter in which you'll be arranging the cake with a little cream, then arrange a layer of soaked biscuits. Put another layer of cream, biscuits dipped in milk and liqueur again. Finish off with cream. Leave cake for 12 hours in the fridge.
Once you take the cake out, decorate it with whipped cream and Raffaello bonbons. Sprinkle with coconut flakes.