This is a very good way to serve blackberries as the top of the dessert is both soft and crisp. Recipe from The Pleasures of the Table: Rediscovering Theodora Fitzgibbon.
450 g Blackberries
A little water
75 g and 50g castor sugar
1 egg yolk
4 tbsp milk
3–4 sponge cakes or double sponge fingers
1 egg white
Cream to serve