polenta, for dusting
2 tbsp caraway seeds
2 tbsp olive oil, plus a little extra for greasing
400g/14oz rye flour
1 tbsp salt
800g/1lb 12oz strong white bread flour
1 tbsp black treacle
20g/¾oz fresh yeast
1 free-range egg, beaten
2 tbsp yoghurt
600ml/20fl oz strong beer