200g/7oz button mushrooms, halved
1 onion, thinly sliced
2 tbsp bottled brown sauce, such as HP sauce
400g tin chopped tomatoes
100g/3陆oz cooked haricot beans (about half a 400g tin, drained and rinsed) (optional)
2 tbsp olive oil
4 free-range eggs
2 slices black pudding, crumbled (optional)
100g/3陆oz smoked bacon lardons
6 sausages, skins removed, shaped into small balls