4 onions, chopped
70g/2½oz whole rolled jumbo oats
500g/1lb 2oz bread flour with malted grains
85g/3oz rye flour
1 tsp salt
1 tsp sugar
4 tbsp vegetable oil
2 sachets fast action dried yeast
150g/5½oz mature Cheddar, cut into 1cm/½in cubes
500ml/18fl oz bitter