Lemon white chocolate cheesecake with cherry coulis and walnut crumb (Andrew Ballard)

Name: Lemon white chocolate cheesecake with cherry coulis and walnut crumb (Andrew Ballard)
Prep time: 10 min
Cook time: 1 h 15 min
Total time: 1 h 15 min
Yield: 6 portions
Ingredients: 120 g white chocolate; 100 g milk; 250 g cream cheese; 250 g mascarpone cheese; 80 g caster sugar; 2 eggs; ½ lemon; 1 tsp cornflour; 1 tsp vanilla essence; 500 g water; 100 g pitted cherries; 50 g sugar; 1 vanilla bean; 15 g lemon juice; 2 stalks rhubarb; 50 g butter; 60 g Biscoff biscuits; 50 g walnuts