1. Line a loaf tin with tin foil or baking paper. 2. First, make the puree. Place the plums, water and sugar in a pot, and slowly bring to a simmer until the plums are completely softened.

Simmer the plums with the blackberries ... Let cool slightly, then puree and press through a sieve to remove seeds and skin. You should have about 2 cups puree. Stir in the cassis and lemon ...