Chocolate and passion fruit bavarois

100g of all-chocolate biscuits

1 1/2 gelatine leaves

30g of caster sugar

80g of dark chocolate, finely chopped

2 egg yolks

35g of sugar

20g of chocolate, to decorate

80g of butter

2 eggs

140ml of milk

60ml of double cream

100g of passion fruit, pulp (approx 4 passion fruits)