Place the rhubarb in a saucepan with the honey. Cook gently for 20 minutes to obtain a soft pulp. Leave to cool. Reserve 4 dessertspoons of the pulp.
Beat the mascarpone in a bowl until smooth and creamy, then stir in the rhubarb. Do not over stir, the cream should have a marbled effect. Whip the cream to soft peaks, then fold into the rhubarb mix.
Serve in a glasses with a the rhubarb pulp on top. Goes really well with a ginger biscuit