350g/12oz jam, flavour of your choice
40²µ/1Β½΄Η³ϊ caster sugar
50g/1ΒΎoz vanilla sugar or caster sugar
1 tsp salt
250g/9oz strong white flour, sifted
vegetable oil, for deep-frying
1 x 7g sachet fast-action yeast
50g/1ΒΎoz unsalted butter, melted and cooled slightly
1 free-range egg, lightly beaten
150ml/5fl oz milk, warmed to about 38C