
Step 1 · Cook the Potatoes
Put the potatoes in a saucepan, cover with cold water and bring to a boil. Simmer for 8 to 10 minutes, until just tender, then drain well.
Step 2 · Brown the Beef
While the potatoes cook, heat the oil in a large frying pan over high heat. Brown the beef for 5 minutes, breaking it up.
Step 3 · Cook the Onion
Add the onion and cook for 3 minutes. Stir in the tomato purée, mustard and Worcestershire sauce for 30 seconds.
Step 4 · Combine Ingredients
Add the drained potatoes, stock or water and salt. Simmer for 3 minutes, stirring gently, then add the peas and cook for 2 minutes.
Step 5 · Melt the Cheese
Scatter over the cheddar, cover and reduce the heat to low for 2 minutes, until the cheese melts. Taste before adding more salt and serve.