Butter an 850ml pudding bowl and pour the golden syrup in the bottom.
In a large mixing bowl, cream the butter with the sugar and zest. Add the eggs, and beat until well combined. Then, gently fold in the flour. Pour on top of syrup
Cover the top of your bowl with two layers of greaseproof paper, and tie them in place with string. This will create a handle that you can use to lift the bowl out.
Pre-steaming the pudding is done by placing the lid over the pressure cooker for 10 minutes, but without cooking it under pressure. Turn the pressure regulator up to 12 to bring pressure to a boil, and cook for 35 min. Release the pressure slowly
Meanwhile, blend half the berries to a smooth consistency, then add the sugar and the whole berries.
Serve berries warm or at room temp with the pudding. If you cannot find fresh berries, use frozen berries. Blend the berries without defrosting them, otherwise they’ll stick together.