50²µ/1¾´Ç³ú mushrooms, finely sliced
1 onion, finely chopped
1 red or orange pepper, deseeded and cut into rings
400g/14oz potatoes
1 tsp grain mustard (optional)
black pepper (optional)
30g/1oz low-fat mature Cheddar cheese
4 large free-range eggs
crusty bread, to serve
50²µ/1¾´Ç³ú frozen peas